Avi Loeb

אבי לייב

Loeb in 2023

Born|

Abraham Loeb

(1962-02-26) February 26, 1962 (age 64)

Beit Hanan, Israel

Alma mater| Hebrew University of Jerusalem (BSc, MSc, PhD)
Scientific career
Fields| Cosmology, astrophysics
Institutions| Institute for Advanced Study
Harvard University
Thesis| Particle acceleration to high energies and amplification of coherent radiation by electromagnetic interactions in plasmas (1986)
Doctoral advisor| Shalom Eliezer
Lazar Friedland
Other academic advisors| John N. Bahcall
Doctoral students| Daniel Eisenstein

Abraham "Avi" Loeb (Hebrew: אברהם (אבי) לייב; born February 26, 1962) is an Israeli and American theoretical physicist who works on astrophysics and cosmology. Loeb is the Frank B. Baird Jr. Professor of Science at Harvard University.[1][2][3][4][5][6] He chaired the Department of Astronomy from 2011 to 2020, and founded the Black Hole Initiative in 2016.

Loeb is a fellow of the American Academy of Arts and Sciences, the American Physical Society, and the International Academy of Astronautics. In 2015, he was appointed as the science theory director for the Breakthrough Initiatives of the Breakthrough Prize Foundation.

Loeb has published popular science books including Extraterrestrial: The First Sign of Intelligent Life Beyond Earth (2021) and Interstellar: The Search for Extraterrestrial Life and Our Future in the Stars (2023).

Since 2017, Loeb has made a series of claims that alien space craft may be in the Solar System. He has argued that ʻOumuamua and other interstellar objects, including the reputedly interstellar meteor CNEOS 2014-01-08, are potential examples of such craft.[7] These claims have been widely rejected by the scientific community.[8][9][10] In 2023, he claimed to have recovered spherules formed by the impact of CNEOS 2014-01-08 that he alleged could be evidence of an alien starship,[11] but the location in the ocean where he recovered the spherules was based on mistaking a seismic signal from a truck for the impact of the meteor.[12][9] During an appearance on Joe Rogan's podcast, he also claimed that whether an ancient "sophisticated civilization" existed on Earth before humanity is credible question to ask.[13][14][15][16] Loeb tends to publicize his results before undergoing peer review, contributing to a climate of sensationalism around his claims.[17]

## Contents

* 1 Life and career
* 1.1 Life in the universe
* 1.2 Claims about alien life
* 1.2.1 ʻOumuamua
* 1.2.2 The Galileo Project
* 1.2.2.1 CNEOS 2014-01-08
* 1.2.3 3I/ATLAS
* 2 Media appearances
* 3 Honors and awards
* 4 See also
* 5 Selected publications
* 6 References
* 7 External links

## Life and career

Loeb was born in Beit Hanan,[18] Israel, in 1962. He took part in the national Talpiot program research program of the Israeli Defense Forces at age 18.[19] While in Talpiot, he obtained a BSc degree in physics and mathematics in 1983, an MSc degree in physics in 1985, and a PhD in plasma physics in 1986, all from the Hebrew University of Jerusalem (HUJI).[5] During his doctoral studies, Loeb conducted research at the Soreq Nuclear Research Center in Yavne.[20] His PhD thesis focused on the modeling of plasma acceleration of charged particles.[21] From 1983 to 1988, he led the first international project supported by the U.S. Strategic Defense Initiative on a new propulsion method for high-speed projectiles.[22] Between 1988 and 1993, Loeb was a long-term member at the Institute for Advanced Study at Princeton, where he started to work in theoretical astrophysics under the supervision of John Bahcall.

In 1993, he moved to Harvard University as an assistant professor in the department of astronomy, and was tenured three years later.[4][6][2] Since 2007, he has been Director of the Institute for Theory and Computation at the Harvard-Smithsonian Center for Astrophysics.[1] Since 2012, Loeb became the Frank B. Baird Jr. Professor of Science at Harvard.[23]

Loeb has written eight books, including the textbooks How Did the First Stars and Galaxies Form?[24][25] and The First Galaxies in the Universe.[26] He has co-authored many papers on topics in astrophysics and cosmology,[2][5] including the first stars, the epoch of reionization, the formation and evolution of massive black holes, the search for extraterrestrial life, gravitational lensing by planets, gamma-ray bursts at high redshifts, the use of the Lyman-alpha forest to measure the acceleration/deceleration of the universe in real time,[27] the future collision between the Milky Way and Andromeda galaxies,[28] the future state of extragalactic astronomy,[29] astrophysical implications of black hole recoil in galaxy mergers,[30] tidal disruption of stars,[31] and imaging black hole silhouettes.[32][3]

Together with his postdoc James Guillochon, Loeb predicted the existence of a new population of stars moving near the speed of light throughout the universe.[33] Together with his postdoc John Forbes and Howard Chen of Northwestern University, Loeb made another prediction that sub-Neptune-sized exoplanets have been transformed into rocky super-Earths by the activity of Sagittarius A*.[34]

Together with Paolo Pani, Loeb showed in 2013 that primordial black holes in the range between the masses of the Moon and the Sun cannot make up dark matter.[35] In 2025, Loeb, in collaboration with Oem Trivedi, proposed that dark matter could consist of remnants of Planck Stars formed after the evaporation of primordial black holes.[36] Loeb led a team that reported tentative evidence for the birth of a black hole in the young nearby supernova SN 1979C.[37] In collaboration with Dan Maoz, Loeb demonstrated in 2013 that biomarkers, such as molecular oxygen (O2), can be detected by the James Webb Space Telescope (JWST) in the atmosphere of Earth-mass planets in the habitable zone of white dwarfs.[38]

In 2018, he served a term as chair of the board on Physics and Astronomy (BPA)[39] of the National Academies of Sciences, Engineering, and Medicine (NASEM).

### Life in the universe

In 2013, Loeb wrote about the "Habitable Epoch of the Early Universe", noting that the Cosmic Microwave Background would temporarily have been at temperatures compatible with liquid water around 15 million years after the Big Bang.[40][41] In April 2021, he presented an updated summary of his ideas of life in the early universe.[42]

In 2020, Loeb published a paper about the possibility that life can propagate from one planet to another,[43] followed by the opinion piece "Noah's Spaceship" about directed panspermia.[44]

### Claims about alien life

Loeb's claims about alien life have attracted sustained criticism from other scientists. Steve Desch, an astrophysicist at Arizona State University referred to Loeb's claims as "ridiculous sensationalism" which represent "a real breakdown of the peer review process and the scientific method".[12] Some of Loeb's claims have been described as conspiracy theories, with USA Today referring to Loeb's speculation about 3I/ATLAS as an "outlandish conspiracy theor[y]."[45] Other scientists have described Loeb's theories as "nonsense", comparable to the idea that "the moon is made of cheese."[46]

In 2024, Loeb delivered a speech in which he declared his view that the Messiah will be an alien who arrives from outer space.[47]

#### ʻOumuamua

Main article: Astronomy:ʻOumuamua

ʻOumuamua was the first confirmed interstellar object detected in the Solar System. In December 2017, Loeb cited ʻOumuamua's unusually elongated shape as one of the reasons the Green Bank Telescope in West Virginia should listen for radio emissions from it to see if there were any unexpected signs that it might be of artificial origin,[48] although earlier limited observations by other radio telescopes such as the SETI Institute's Allen Telescope Array had produced no such results.[49] The Green Bank Telescope observed the asteroid for six hours, detecting no radio signals.[50][51]

On October 26, 2018, Loeb and his postdoctoral student Shmuel Bialy submitted a paper exploring the possibility that ʻOumuamua is an artificial thin solar sail accelerated by solar radiation pressure in an effort to help explain the object's non-gravitational acceleration.[52][53][54] The consensus among other astrophysicists was that the available evidence is insufficient to consider such a premise,[55][56][57] and that a tumbling solar sail would not be able to accelerate.[58][59] In response, Loeb wrote an article detailing six anomalous properties of ʻOumuamua that make it unusual, unlike any comets or asteroids seen before.[60][61] By 2021, there was widespread consensus in the scientific community that 1I/ʻOumuamua had properties entirely consistent with a naturally occurring object, perhaps made of nitrogen ice,[10] or a comet-like body that was altered by warming as it travelled through the solar system.[62]

On November 27, 2018, Loeb and Amir Siraj, a Harvard undergraduate, proposed a search for ʻOumuamua-like objects that might be trapped in the Solar System as a result of losing orbital energy through a close encounter with Jupiter.[63] They identified four candidates (2011 SP25, 2017 RR2, 2017 SV13, and 2018 TL6) for trapped interstellar objects that dedicated missions could visit. The authors pointed out that future sky surveys, such as with Large Synoptic Survey Telescope, could find many more.[64]

In public interviews and private communications with reporters and academic colleagues, Loeb has become more vocal about the prospects of proving the existence of alien life.[65] On April 16, 2019, Loeb and Siraj reported the discovery of a meteor of interstellar origin.[66] Extraterrestrial: The First Sign of Intelligent Life Beyond Earth, a popular science account of ʻOumuamua by Loeb,[67] was published in 2021.[68][69][70] A followup book, Interstellar: The Search for Extraterrestrial Life and Our Future in the Stars, was published on August 29, 2023.[71][72]

#### The Galileo Project

"Constructing new telescope systems to infer the nature of Unidentified Aerial Phenomena (UAP), similar to those mentioned in the ODNI report (ODNI 2021) to the US Congress"[73]

Main article: Astronomy:The Galileo Project

In July 2021, Loeb founded the Galileo Project for the Systematic Scientific Search for Evidence of Extraterrestrial Technological Artifacts.[74][75] The project was inspired by the detection of ʻOumuamua and by release of the Office of the Director of National Intelligence report on Unidentified Aerial Phenomena (UAP). As stated on the project's website, the aim is:

“  | Given the recently discovered abundance of Earth-Sun systems, the Galileo Project is dedicated to the proposition that humans can no longer ignore the possible existence of Extraterrestrial Technological Civilizations (ETCs), and that science should not dogmatically reject potential extraterrestrial explanations because of social stigma or cultural preferences, factors which are not conducive to the scientific method of unbiased, empirical inquiry. We now must 'dare to look through new telescopes', both literally and figuratively.[74] | ”

|
|

The three main avenues of research are:[76]

* Obtaining high-resolution images of UAPs and discovering their nature
* Searching for and research of ʻOumuamua-like interstellar objects
* Searching for potential ETC satellites

Unlike other similar projects, the goal of the Galileo Project is to search for physical objects, and not electromagnetic signals, associated with extraterrestrial technological equipment.[77] The project was covered by many independent publishers, among them Nature, Science, New York Post, Scientific American, The Guardian, etc.[78] To allegations that studies of UFOs is pseudoscience, Loeb answers that the project aims not to study UFOs based on previous data, but to study Unidentified Aerial Phenomena "using the standard scientific method based on a transparent analysis of open scientific data to be collected using optimized instruments".[79]

##### CNEOS 2014-01-08

Main article: Astronomy:CNEOS 2014-01-08

In 2014, the US Department of Defense observed a fireball entering the atmosphere.[80] Loeb made a series of claims about this event, from the meteor being from outside the Solar System to its likely area of impact based on, among other things, a seismic signal that occurred around the same time,[81] all culminating in 2023, when Loeb announced that he had found interstellar material on the ocean floor[82] that he asserted came from the meteor and could be remnants of an extraterrestrial starship.[80] These claims were criticized by other scientists as hasty, sensational, and part of a pattern of improper behavior. Peter Brown, a meteor physicist at the University of Western Ontario, argued the material can be explained as non-interstellar, noting that measurements from Defense Department data are opaque and error-prone. Brown further said he was disturbed by Loeb's lack of engagement with relevant experts.[12] In March 2022, the U.S. Space Force affirmed that their 2014 data indicated an interstellar origin, while the following month NASA stated the evidence for this was inconclusive.[8]

Astrophysicist Steve Desch, at Arizona State University, commented "[Loeb's claims are] polluting good science—conflating the good science we do with this ridiculous sensationalism and sucking all the oxygen out of the room", and said several of his colleagues are consequently refusing to engage with Loeb in the peer review process.[12] Monica Grady from the Open University argued that the evidence for Loeb's claims is "rather shaky" and pointed more plausibly to terrestrial pollution.[80] Patricio A. Gallardo in an American Astronomical Society paper similarly concluded the samples were consistent with coal ash contamination.[83] Loeb subsequently authored a preprint saying chemical analysis ruled out coal ash contamination and indicated extrasolar origins.[84][85] Loeb and Morgan MacLeod proposed a tidal disruption mechanism that could cause meteors to be ejected into trajectories leading to the described observations.[86] In 2024 planetary seismologist Benjamin Fernando led a team that analyzed the seismic signals that led Loeb to search that specific region of the ocean, and they concluded that the seismic signals from one of the sensors used was in fact caused not by a meteor, but by a truck driving near the sensor, so that, "Not only did they use the wrong signal, they were looking in the wrong place."[87]

#### 3I/ATLAS

In 2025, ATLAS (Asteroid Terrestrial-impact Last Alert System), the NASA-funded survey telescope in Rio Hurtado, Chile, observed a comet approaching from the constellation of Sagittarius at an interstellar velocity. Loeb hypothesized in the press that it, the third known interstellar object, could be an alien device with potentially malevolent intent. He based these speculations on his calculations of the likelihood of a comet of natural origins having these characteristics. "The retrograde orbital plane of 3I/ATLAS around the Sun lies within 5 degrees of that of Earth... The likelihood for that coincidence out of all random orientations is 0.2 percent," Loeb told Newsweek. He further claimed that the brightness of 3I/ATLAS implies an object that is around 20 kilometers in diameter which is "too large for an interstellar asteroid." 3I/ATLAS' trajectory will bring it close to Venus, Mars and Jupiter, a path Loeb calculated as having a probability of just 0.005 percent. "It might have targeted the inner Solar System as expected from alien technology," he added. Richard Moissl, Head of Planetary Defence at the European Space Agency told Newsweek: "There have been no signs pointing to non-natural origins of 3I/ATLAS in the available observations."[88] Since then, observations have reported evidence of 3I/ATLAS containing water, which is a substance commonly found in comets.[89][90]

Independent assessments have resoundingly rejected the idea that 3I/ATLAS is anything except a comet. Nicola Fox, associate administrator of NASA's Science Mission Directorate said that "We certainly haven't seen any technosignatures or anything from it that would lead us to believe it was anything other than a comet". Similarly, NASA Associate Administrator Amit Kshatriya stated that "all evidence points to it being a comet."[91] In the face of this growing body of evidence, Loeb conceded that 3I/ATLAS is "most likely" a comet, though he continued to speculate about its supposed technological nature regardless.[92][93]

## Media appearances

In 2006, Loeb was featured in a Time magazine cover story on the first stars, and in a Scientific American article on the Dark Ages of the universe. In 2008, he was featured in a Smithsonian magazine cover story on black holes, and in two Astronomy magazine cover stories, one on the collision between the Milky Way and the Andromeda Galaxy and the second on the future state of our universe. In 2009, Loeb reviewed in a Scientific American article a new technique for imaging black hole silhouettes. Loeb received considerable media attention[94] after proposing in 2011 (with E.L. Turner) a new technique for detecting artificially-illuminated objects in the Solar System and beyond,[95] and showing in 2012 (with I. Ginsburg) that planets may transit hypervelocity stars or get kicked to a fraction of the speed of light near the black hole at the center of the Milky Way.[96]

He has been profiled a number of times, including in Science magazine,[97] Discover,[98] and The New York Times.[99] He has been interviewed by Astronomy magazine,[100] by Lex Fridman,[101] Let's Get Haunted,[102] Joe Rogan,[103] Mick West,[104] and by the H3 Podcast.[105] On August 24, 2023, The New York Times published an article about Loeb and his search for signs of extraterrestrial life.[71]

Loeb also regularly writes opinion essays on science and policy.[106][107]

## Honors and awards

Loeb has received many honors, including:[5]

* 1987 – The Kennedy Prize of the Hebrew University of Jerusalem
* 2002 – Guggenheim Fellowship[108]
* 2004 – Distinguished Visiting Professorship at the Faculty of Physics & Einstein Center for Theoretical Physics of the Weizmann Institute of Science
* 2006/7 – John Bahcall Lecturer at the Tel Aviv University
* 2006 – Salpeter Lectureship at Cornell University
* 2012 – Time magazine's 25 most influential people in space.[109]
* 2012 – Elected member of the American Academy of Arts and Sciences
* 2012 – Galileo Galilei Chair (Cattedra Galileiana) Award of the Scuola Normale Superiore, Pisa, Italy
* 2013 – Chambliss Astronomical Writing Award from the American Astronomical Society, for How Did the First Stars and Galaxies Form? (2010)
* 2014 – Member of the Board on Physics and Astronomy (BPA) of the National Academies of Sciences, Engineering, and Medicine
* 2015 – Elected Fellow of the International Academy of Astronautics (IAA) SETI Permanent Committee
* 2015 – Elected Member of the American Physical Society (APS)
* 2020 – Appointed to the President's Council of Advisors on Science and Technology[110]

## See also

* UFO conspiracy theories
* CNEOS 2014-01-08

## Selected publications

* Abraham Loeb, Adam Hibberd, and Adam Crowl (2025). "Intercepting 3I/ATLAS at Closest Approach to Jupiter with the Juno spacecraft". arXiv.

## References

1. ↑ 1.0 1.1 "Avi Loeb". Harvard University. https://itc.cfa.harvard.edu/people/avi-loeb.
2. ↑ 2.0 2.1 2.2 "Professor Avi Loeb". Harvard University. https://www.cfa.harvard.edu/~loeb.
3. ↑ 3.0 3.1 "Abraham (Avi) Loeb". Harvard University. https://bhi.fas.harvard.edu/people/avi-loeb.
4. ↑ 4.0 4.1 Loeb, Avi. "Autobiographical sketch". https://www.cfa.harvard.edu/~loeb/Loeb_Autobiography.pdf.
5. ↑ 5.0 5.1 5.2 5.3 Loeb, Abraham. "Curriculum Vitae of Abraham Loeb". https://lweb.cfa.harvard.edu/~loeb/vitae.pdf.
6. ↑ 6.0 6.1 "Avi Loeb". Harvard University. https://astronomy.fas.harvard.edu/people/avi-loeb.
7. ↑ Groll, Johan (January 7, 2019). "Thinking About Distant Civilizations Isn't Speculative". Der Spiegel. http://www.spiegel.de/international/zeitgeist/astronomer-avi-loeb-on-the-interstellar-body-oumuamua-a-1246803.html.
8. ↑ 8.0 8.1 "Harvard astronomer believes an interstellar meteor (or craft) smashed into Earth in 2014 — others aren't so sure" (in en). 2022-04-15. https://www.inverse.com/science/interstellar-meteor-2014-discovery.
9. ↑ 9.0 9.1 "The humiliating truth behind Harvard astronomer's "alien" spherules" (in en-US). 2024-03-13. https://bigthink.com/starts-with-a-bang/truth-harvard-astronomer-alien-spherules/.
10. ↑ 10.0 10.1 "'Oumuamua wasn't an alien spacecraft, and ignoring the science can't make it so" (in en-US). 2021-11-18. https://bigthink.com/starts-with-a-bang/oumuamua-alien-spacecraft/.
11. ↑ "Why a Harvard professor thinks he may have found fragments of an alien spacecraft" (in en). 2023-07-05. https://www.independent.co.uk/news/world/americas/avi-loeb-interstellar-object-aliens-b2369534.html.
12. ↑ 12.0 12.1 12.2 12.3 Miller, Katrina (24 July 2023). "Scientist's Deep Dive for Alien Life Leaves His Peers Dubious - Avi Loeb, a Harvard astrophysicist, says that material recovered from the seafloor could be from an extraterrestrial spacecraft. His peers are skeptical. + comment". The New York Times. https://www.nytimes.com/2023/07/24/science/avi-loeb-extraterrestrial-life.html.
13. ↑ Loeb, Avi (Nov 21, 2023). "Are UAPs Relics from an Earlier Civilization on Earth?". https://avi-loeb.medium.com/are-uaps-relics-from-an-earlier-civilization-on-earth-86d1190c6539.
14. ↑ Loeb, Avi (Oct 13, 2022). "Lost Civilizations from Our Cosmic Past". https://avi-loeb.medium.com/lost-civilizations-from-our-cosmic-past-a778e50b5c55.
15. ↑ "Transcript: Physicist Avi Loeb on Joe Rogan Podcast #2401". October 29, 2025. https://singjupost.com/transcript-physicist-avi-loeb-on-joe-rogan-podcast-2401/.
16. ↑ Billings, Lee (1 April 2021). "Astronomer Avi Loeb Says Aliens Have Visited, and He's Not Kidding" (in en). https://www.scientificamerican.com/article/astronomer-avi-loeb-says-aliens-have-visited-and-hes-not-kidding1/.
17. ↑ Miller, Katrina (July 24, 2023). "Scientist's Deep Dive for Alien Life Leaves His Peers Dubious (Published 2023)" (in en). The New York Times. https://www.nytimes.com/2023/07/24/science/avi-loeb-extraterrestrial-life.html. "Many astronomers, though, see the announcement as the latest example of Dr. Loeb making an outlandish declaration that is too strong and too hasty. His pronouncements (and a promotional video in Times Square about the search for extraterrestrial life) skew public perception of how science actually works, they say.
“People are sick of hearing about Avi Loeb’s wild claims,” said Steve Desch, an astrophysicist at Arizona State University. “It’s polluting good science — conflating the good science we do with this ridiculous sensationalism and sucking all the oxygen out of the room.”
Dr. Desch added that several of his colleagues were now refusing to engage with Dr. Loeb’s work in peer review, the process by which scholars evaluate one another’s research to ensure that only high-quality studies are published. “It’s a real breakdown of the peer review process and the scientific method,” he said. “And it’s so demoralizing and tiring.”"
18. ↑ Carmeli, Oded (2019). "If true, this could be one of the greatest discoveries in human history" (in en). Haaretz.com. https://www.haaretz.com/us-news/.premium.MAGAZINE-if-true-this-could-be-one-of-the-greatest-discoveries-in-human-history-1.6828318.
19. ↑ Avi Loeb \- website American Friends of the Hebrew University
20. ↑ Miryam (2018-10-24). "Avi Loeb" (in en-US). https://www.afhu.org/2018/10/24/avi-loeb/.
21. ↑ Loeb, Abraham (1986). "Particle acceleration to high energies and amplification of coherent radiation by electromagnetic interactions in plasmas". https://inis.iaea.org/records/3bc5b-b0b03.
22. ↑ Gritz, Jennie Rothenberg. "The Wonder of Avi Loeb" (in en). https://www.smithsonianmag.com/science-nature/wonder-avi-loeb-180978579/.
23. ↑ "Avi Loeb appointed the Frank B. Baird Jr. Professor of Science | Department of Astronomy" (in en). 2012-09-10. https://astronomy.fas.harvard.edu/announcements/avi-loeb-appointed-frank-b-baird-jr-professor-science.
24. ↑ "How Did the First Stars and Galaxies Form?" book jacket (pdf)
25. ↑ Loeb, Abraham (February 8, 2016). Loeb, A.: How Did the First Stars and Galaxies Form? (eBook and Paperback). Princeton University Press. ISBN 978-0-691-14516-7. http://press.princeton.edu/titles/9373.html. Retrieved February 19, 2016.
26. ↑ ""The First Galaxies in the Universe" by Loeb and Furlanetto". https://www.cfa.harvard.edu/~loeb/LF/.
27. ↑ Abraham Loeb (1998). "Direct Measurement of Cosmological Parameters from the Cosmic Deceleration of Extragalactic Objects". The Astrophysical Journal 499 (2): L111–L114. doi:10.1086/311375. Bibcode: 1998ApJ...499L.111L.
28. ↑ Cox, T. J.; Loeb, Abraham (2008). "The collision between the Milky Way and Andromeda". Monthly Notices of the Royal Astronomical Society 386 (1): 461–474. doi:10.1111/j.1365-2966.2008.13048.x. Bibcode: 2008MNRAS.386..461C.
29. ↑ Loeb, Abraham (2002). "Long-term future of extragalactic astronomy". Physical Review D 65 (4). doi:10.1103/PhysRevD.65.047301. Bibcode: 2002PhRvD..65d7301L.
30. ↑ o'Leary, Ryan M.; Loeb, Abraham (2012). "Recoiled star clusters in the Milky Way halo: N-body simulations and a candidate search through the SDSS". Monthly Notices of the Royal Astronomical Society 421 (4): 2737–2750. doi:10.1111/j.1365-2966.2011.20078.x. Bibcode: 2012MNRAS.421.2737O.
31. ↑ Stone, N; Loeb, A (2012). "Observing Lense-Thirring Precession in Tidal Disruption Flares". Physical Review Letters 108 (6). doi:10.1103/PhysRevLett.108.061302. PMID 22401052. Bibcode: 2012PhRvL.108f1302S.
32. ↑ Broderick, Avery E.; Loeb, Abraham (2006). "Testing General Relativity with High-Resolution Imaging of Sgr A*". Physics:Journal of Physics: Conference Series 54: 448–455. doi:10.1088/1742-6596/54/1/070. Bibcode: 2006JPhCS..54..448B.
33. ↑ Lemonick, Michael D. (November 26, 2014). "You've Heard of Shooting Stars, But This is Ridiculous". Time. https://time.com/3602047/hypervelocity-stars/.
34. ↑ Howard Chen; John C. Forbes; Abraham Loeb (2018). "Habitable Evaporated Cores and the Occurrence of Panspermia Near the Galactic Center". The Astrophysical Journal Letters 855 (1): L1. doi:10.3847/2041-8213/aaab46. Bibcode: 2018ApJ...855L...1C.
35. ↑ "The Mystery of Dark Matter Clarified—a Little". Time. September 5, 2013. https://science.time.com/2013/09/05/the-mystery-of-dark-matter-clarified-a-little/.
36. ↑ Trivedi, Oem; Loeb, Avi (2025). "Could Planck Star Remnants Be Dark Matter?". Physics of the Dark Universe 44. doi:10.1016/j.dark.2025.102003. Bibcode: 2025PDU....4902003T.
37. ↑ "Supernova Shines Light On Black Hole Formation". https://www.npr.org/2010/11/15/131336737/supernova-shines-light-on-black-hole-formation?ft=1&f=1026.
38. ↑ "Could Tiny Stars Be Home to Mirror Earths?". Time. March 6, 2013. https://science.time.com/2013/03/06/could-tiny-stars-be-home-to-mirror-earths/.
39. ↑ "BPA". http://sites.nationalacademies.org/BPA/index.htm.
40. ↑ Loeb, Abraham (September 9, 2014). "The habitable epoch of the early Universe". International Journal of Astrobiology 13 (4): 337–339. doi:10.1017/S1473550414000196. Bibcode: 2014IJAsB..13..337L.
41. ↑ Adam Frank (February 4, 2014). "First Life In The Universe: 13.7: Cosmos And Culture". https://www.npr.org/blogs/13.7/2014/02/03/271093289/eureka-first-life-in-the-universe.
42. ↑ Loeb, Avi (April 4, 2021). "When Did Life First Emerge in the Universe? - We don't know, but we could try to find out by searching for it on planets orbiting the very oldest stars". Scientific American. https://www.scientificamerican.com/article/when-did-life-first-emerge-in-the-universe/.
43. ↑ Siraj, Amir; Loeb, Abraham (April 17, 2020). "Possible Transfer of Life by Earth-Grazing Objects to Exoplanetary Systems". Life 10 (4): 44. doi:10.3390/life10040044. ISSN 2075-1729. PMID 32316564. Bibcode: 2020Life...10...44S.
44. ↑ Loeb, Avi (November 29, 2020). "Noah's Spaceship" (in en). https://www.scientificamerican.com/article/noahs-spaceship/.
45. ↑ Lagatta, Eric. "NASA drops never-before-seen photos of interstellar 3I/ATLAS. Here's a look" (in en-US). https://www.usatoday.com/story/news/2025/11/20/3iatlas-photos-nasa-images-alien/87350869007/. "The strange outsider's jaunt through Earth's cosmic neighborhood has sparked plenty of outlandish conspiracy theories regarding its nature.
One particularly infamous idea – put forth by a Harvard astrophysicist named Avi Loeb – is that 3I/ATLAS could be an alien spaceship."
46. ↑ Dunham, Will. "NASA releases images of comet 3I/ATLAS, rejects alien spacecraft 'rumors'". Reuters. https://www.reuters.com/science/nasa-set-release-new-images-interstellar-object-3iatlas-2025-11-19/. "University of Oxford astrophysicist Chris Lintott told Reuters: "So far, it seems to be made of the same sort of stuff we see for comets in our solar system - plenty of carbon dioxide and some water, carbon monoxide and other such molecules. We've also seen cyanide - normal for a comet - and lots of nickel, which is a bit surprising but not too unprecedented. We saw similar things in a previous interstellar comet, 2I/Borisov, and in some solar system comets."
"The idea that 3I/ATLAS could be an alien spacecraft is simply nonsense. There's nothing about it that suggests such a thing, and you might as well argue that the moon is made of cheese," Lintott said."
47. ↑ Wiedeman, Reeves (2024-02-12). "Bill Ackman Strikes Back" (in en). https://nymag.com/intelligencer/article/bill-ackman-war-harvard-mit-dei-claudine-gay.html. "Loeb took the idea and suggested looking for hope from above. "My personal belief is that the Messiah will arrive, not necessarily from Brooklyn, as some Orthodox Jews believe, but rather from outer space," Loeb told the group."
48. ↑ Ian Sample (December 11, 2017). "Astronomers to check interstellar body for signs of alien technology". The Guardian. https://www.theguardian.com/science/2017/dec/11/astronomers-to-check-interstellar-body-for-signs-of-alien-technology. "Green Bank telescope in West Virginia will listen for radio signals from ʻOumuamua, an object from another solar system ... "Most likely it is of natural origin, but because it is so peculiar, we would like to check if it has any sign of artificial origin, such as radio emissions," said Avi Loeb, professor of astronomy at Harvard University and an adviser to the Breakthrough Listen project. "If we do detect a signal that appears artificial in origin, we'll know immediately." ... While many astronomers believe the object is an interstellar asteroid, its elongated shape is unlike anything seen in the asteroid belt in our own solar system. Early observations of ʻOumuamua show that it is about 400m long but only one tenth as wide. "It's curious that the first object we see from outside the solar system looks like that," said Loeb."
49. ↑ Billings, Lee (December 11, 2017). "Alien Probe or Galactic Driftwood? SETI Tunes In to ʻOumuamua". Scientific American. https://www.scientificamerican.com/article/alien-probe-or-galactic-driftwood-seti-tunes-in-to-oumuamua/. Retrieved December 12, 2017. "So far limited observations of 'Oumuamua, using facilities such as the SETI Institute's Allen Telescope Array, have turned up nothing.".
50. ↑ "Breakthrough Listen Releases Initial Results and Data from Observations of 'Oumuamua". Breakthrough Listen. December 13, 2017. http://breakthroughinitiatives.org/news/15. ""No evidence of artificial signals emanating from the object so far detected by the Green Bank Telescope, but monitoring and analysis continue. Initial data are available for public inspection in the Breakthrough Listen archive""
51. ↑ Ian Sample (December 15, 2017). "Is 'Oumuamua an alien spacecraft? Initial scans show no signs of technology". The Guardian. https://www.theguardian.com/science/2017/dec/14/is-oumuamua-an-alien-spacecraft-first-scans-show-no-signs-of-technology.
52. ↑ Williams, Matt (November 2, 2018). "Could Oumuamua Be an Extra-Terrestrial Solar Sail?". Universe Today. https://www.universetoday.com/140391/could-oumuamua-be-an-extra-terrestrial-solar-sail/.
53. ↑ Bialy, Shmuel; Loeb, Abraham (October 26, 2018). "Could Solar Radiation Pressure Explain 'Oumuamua's Peculiar Acceleration?". The Astrophysical Journal 868 (1): L1. doi:10.3847/2041-8213/aaeda8. Bibcode: 2018ApJ...868L...1B.
54. ↑ Loeb, Abraham (September 26, 2018). "How to Search for Dead Cosmic Civilizations". Scientific American. https://blogs.scientificamerican.com/observations/how-to-search-for-dead-cosmic-civilizations/.
55. ↑ Scientists push back against Harvard 'alien spacecraft' theory. Kerry Sheridan, PhysOrg. November 7, 2018.
56. ↑ Boyle, Alan (November 6, 2018). "'Oumuamua, oh my! Was interstellar object actually an alien solar sail? Not so fast". https://www.yahoo.com/news/oumuamua-oh-interstellar-object-actually-225825249.html.
57. ↑ Schadwinkel, Alina (November 8, 2018). "Glaubt dieser Harvard-Professor selbst, was er sagt?". Zeit Online. https://www.zeit.de/wissen/2018-11/oumuamua-lichtsegel-ausserirdische-aliens.
58. ↑ Cigar-shaped interstellar object may have been an alien probe, Harvard paper claims. CNN News. November 6, 2018.
59. ↑ Koren, Marina (January 23, 2019). "When a Harvard Professor Talks About Aliens – News about extraterrestrial life sounds better coming from an expert at a high-prestige institution.". The Atlantic. https://www.theatlantic.com/science/archive/2019/01/oumuamua-interstellar-harvard-astrophysicist/580948/.
60. ↑ Loeb, Abraham (November 20, 2018). "6 Strange Facts about the Interstellar Visitor 'Oumuamua". Scientific American. https://blogs.scientificamerican.com/observations/6-strange-facts-about-the-interstellar-visitor-oumuamua/.
61. ↑ Chotiner, Isaac (January 16, 2019). "Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object 'Oumuamua". The New Yorker. https://www.newyorker.com/news/the-new-yorker-interview/have-aliens-found-us-a-harvard-astronomer-on-the-mysterious-interstellar-object-oumuamua. Retrieved January 16, 2019.
62. ↑ Bergner, Jennifer B.; Seligman, Darryl Z. (2023-03-23). "Acceleration of 1I/'Oumuamua from radiolytically produced H2 in H2O ice" (in en). Nature 615 (7953): 610–613. doi:10.1038/s41586-022-05687-w. ISSN 0028-0836. PMID 36949336. https://www.nature.com/articles/s41586-022-05687-w.
63. ↑ Siraj, Amir; Loeb, Abraham (November 27, 2018). "Identifying Interstellar Objects Trapped in the Solar System through Their Orbital Parameters". arXiv:1811.09632v2 [astro-ph.EP].
64. ↑ Siraj, Amir; Loeb, Abraham (2019). "Identifying Interstellar Objects Trapped in the Solar System through Their Orbital Parameters". The Astrophysical Journal 872 (1): L10. doi:10.3847/2041-8213/ab042a. Bibcode: 2019ApJ...872L..10S.
65. ↑ Post, The Washington. "Harvard's top astronomer says an alien ship may be among us" (in en-US). https://www.nola.com/education/2019/02/harvards-top-astronomer-says-an-alien-ship-may-be-among-us.html.
66. ↑ Siraj, A.; Loeb, A. (April 16, 2019). "Discovery of a Meteor of Interstellar Origin". arXiv:1904.07224 [astro-ph.EP].
67. ↑ Loeb, Avi (June 22, 2021). "A Possible Link between 'Oumuamua and Unidentified Aerial Phenomena - If some UAP turn out to be extraterrestrial technology, they could be dropping sensors for a subsequent craft to tune into. What if 'Oumuamua is such a craft?". Scientific American. https://www.scientificamerican.com/article/a-possible-link-between-oumuamua-and-unidentified-aerial-phenomena/.
68. ↑ "Object that whizzed by Earth probably came from alien world, Harvard professor asserts". January 8, 2021. https://www.cbsnews.com/news/alien-extraterrestrial-oumuamua-space-object-whizzed-by-earth-harvard-professor/.
69. ↑ Tucker, Reed (January 2, 2021). "A Harvard professor says an alien visited in 2017 — and more are coming" (in en-US). https://nypost.com/2021/01/02/a-harvard-professor-says-an-alien-visited-in-2017/.
70. ↑ Anderson, Travis (January 4, 2021). "In new book, Harvard astronomer pushes theory about object that passed through solar system; alien world may have sent it – The Boston Globe" (in en-US). https://www.bostonglobe.com/2021/01/04/metro/new-book-harvard-astronomer-pushes-theory-about-object-that-passed-through-solar-system-alien-world-may-have-sent-it/.
71. ↑ 71.0 71.1 Fletcher, Seth (August 24, 2023). "How a Harvard Professor Became the World's Leading Alien Hunter – Avi Loeb's single-minded search for extraterrestrial life has made him the most famous practicing astronomer in the country — and possibly the most controversial. + comment". The New York Times. https://www.nytimes.com/2023/08/24/magazine/avi-loeb-alien-hunter.html#permid=127237844.
72. ↑ Tingley, -Brett (20 July 2023). "Interstellar meteor fragments found? Harvard astronomer's claim sparks debate, criticism - Avi Loeb is no stranger to controversy.". Space.com. https://www.space.com/interstellar-meteor-avi-loeb-expedition.
73. ↑ Loeb, Abraham (2023). "Overview of the Galileo Project". Journal of Astronomical Instrumentation 12 (1). doi:10.1142/S2251171723400032. Bibcode: 2023JAI....1240003L.
74. ↑ 74.0 74.1 "The Galileo Project: "Daring to Look Through New Telescopes"". Harvard University. https://projects.iq.harvard.edu/galileo.
75. ↑ Loeb, Avi (September 19, 2021). "Astronomers Should be Willing to Look Closer at Weird Objects in the Sky - The Galileo Project seeks to train telescopes on unidentified aerial phenomena". Scientific American. https://www.scientificamerican.com/article/astronomers-should-be-willing-to-look-closer-at-weird-objects-in-the-sky/.
76. ↑ "The Galileo Project: Activities". Harvard University. https://projects.iq.harvard.edu/galileo/activities.
77. ↑ "The Galileo Project" (in en). https://projects.iq.harvard.edu/galileo/home.
78. ↑ "The Galileo Project: Press Coverage". Harvard University. https://projects.iq.harvard.edu/galileo/press-coverage.
79. ↑ "The Galileo Project: Scope". Harvard University. https://projects.iq.harvard.edu/galileo/scope.
80. ↑ 80.0 80.1 80.2 Grady, Monica (2023-07-07). "Physicist who found spherical meteor fragments claims they may come from an alien spaceship – here's what to make of it" (in en). http://theconversation.com/physicist-who-found-spherical-meteor-fragments-claims-they-may-come-from-an-alien-spaceship-heres-what-to-make-of-it-209101.
81. ↑ "The humiliating truth behind Harvard astronomer's "alien" spherules" (in en-US). 2024-03-13. https://bigthink.com/starts-with-a-bang/truth-harvard-astronomer-alien-spherules/.
82. ↑ "I'm a Harvard astronomer. I think we found interstellar material" (in en). 2023-07-05. https://www.newsweek.com/harvard-astronomer-alien-discovery-interstellar-material-1811087.
83. ↑ Gallardo, Patricio A. (2023-10-19). "Anthropogenic Coal Ash as a Contaminant in a Micro-meteoritic Underwater Search". Research Notes of the AAS 7 (10): 220. doi:10.3847/2515-5172/ad03f9. ISSN 2515-5172. Bibcode: 2023RNAAS...7..220G.
84. ↑ Loeb, Abraham; et al. (2024-02-15). "Chemical Classification of Spherules from the Pacific Ocean Site of the CNEOS 2014 January 8 (IM1) Bolide". arXiv:2401.09882 [astro-ph.EP].
85. ↑ Loeb, Abraham (2024-01-19). "Recovery and Classification of Spherules from the Pacific Ocean Site of the CNEOS 2014 January 8 (IM1) Bolide". Research Notes of the AAS 8 (10): 39. doi:10.3847/2515-5172/ad2370. ISSN 2515-5172. Bibcode: 2024RNAAS...8...39L.
86. ↑ Loeb, Abraham and MacLeod Morgan (2024-02-20). "Interstellar meteors from the tidal disruption of rocky planets on eccentric orbits around M dwarfs". Astronomy and Astrophysics 686: A123. doi:10.1051/0004-6361/202449250. Bibcode: 2024A&A...686A.123L.
87. ↑ Krajick, Kevin (April 9, 2024). "Was It an Alien Spacecraft—Or a Delivery Truck?". Columbia. https://news.climate.columbia.edu/2024/04/09/was-it-an-alien-spacecraft-or-a-delivery-truck/.
88. ↑ "Harvard physicist claims new interstellar comet is alien probe" (in en). 2025-07-21. https://www.newsweek.com/interstellar-comet-alien-probe-harvard-physicist-avi-loeb-2101654.
89. ↑ Yang, Bin; Meech, Karen J.; Connelley, Michael; Keane, Jacqueline V. (20 July 2025). "Spectroscopic Characterization of Interstellar Object 3I/ATLAS: Water Ice in the Coma". The Astrophysical Journal 992 (1): L9. doi:10.3847/2041-8213/ae08a7. Bibcode: 2025ApJ...992L...9Y.
90. ↑ Hopkins, Matthew J.; Dorsey, Rosemary C.; Forbes, John C. (9 July 2025). "From a Different Star: 3I/ATLAS in the Context of the Ōtautahi–Oxford Interstellar Object Population Model". The Astrophysical Journal Letters 990 (2): L30. doi:10.3847/2041-8213/adfbf4. Bibcode: 2025ApJ...990L..30H. , Preprint, submitted to ApJ Letters
91. ↑ Dunham, Will. "NASA releases images of comet 3I/ATLAS, rejects alien spacecraft 'rumors'". Reuters. https://www.reuters.com/science/nasa-set-release-new-images-interstellar-object-3iatlas-2025-11-19/.
92. ↑ Lagatta, Eric. "NASA drops never-before-seen photos of interstellar 3I/ATLAS. Here's a look" (in en-US). https://www.usatoday.com/story/news/2025/11/20/3iatlas-photos-nasa-images-alien/87350869007/. "One particularly infamous idea – put forth by a Harvard astrophysicist named Avi Loeb – is that 3I/ATLAS could be an alien spaceship. Though Loeb has conceded on publishing platform Medium that the object is "most likely a comet of natural origin," he has not ruled out the possibility that it could be extraterrestrial technology."
93. ↑ Loeb, Abraham (29 Oct 2025). "A Q & A on 3I/ATLAS at Perihelion". https://avi-loeb.medium.com/a-q-a-on-3i-atlas-at-perihelion-62b7d592519b.
94. ↑ Lemonick, Michael D. (November 10, 2011). "Is There a City on Pluto? Before You Answer, Consider: We've Never Looked. Two Scientists Want to Change That". Time. http://content.time.com/time/health/article/0,8599,2098834,00.html.
95. ↑ Loeb, Abraham; Turner, Edwin L. (April 2012). "Detection Technique for Artificially Illuminated Objects in the Outer Solar System and Beyond". Astrobiology 12 (4): 290–294. doi:10.1089/ast.2011.0758. PMID 22490065. Bibcode: 2012AsBio..12..290L.
96. ↑ Ginsburg, Idan; Loeb, Abraham; Wegner, Gary A. (June 11, 2012). "Hypervelocity planets and transits around hypervelocity stars". Monthly Notices of the Royal Astronomical Society 423 (1): 948–954. doi:10.1111/j.1365-2966.2012.20930.x. Bibcode: 2012MNRAS.423..948G.
97. ↑ Avi Loeb. "NewsFocus: From Cosmic Dawn to Milkomeda, and Beyond". http://www.cfa.harvard.edu/~loeb/Science.pdf.
98. ↑ Steve Nadis. "First". https://www.cfa.harvard.edu/~loeb/FL1.pdf.
99. ↑ Dreifus, Claudia (December 2, 2014). "Much-Discussed Views That Go Way Back – Avi Loeb Ponders the Early Universe, Nature and Life". The New York Times. https://www.nytimes.com/2014/12/02/science/avi-loeb-ponders-the-early-universe-nature-and-life.html.
100. ↑ "Abraham Loeb: From cosmic origins to our galaxy's fate". May 6, 2015. http://www.astronomy.com/magazine/superstars-of-astronomy-podcast/2015/05/abraham-loeb-cosmic-origins-and-our-galaxys-fate.
101. ↑ "#154 – Avi Loeb: Aliens, Black Holes, and the Mystery of the Oumuamua". January 14, 2021. https://lexfridman.com/avi-loeb/.
102. ↑ (in en) Interstellar Object 3I/ATLAS Feat. Dr. Avi Loeb, September 24, 2025, https://podcasts.apple.com/us/podcast/lets-get-haunted/id1457775338?i=1000728181470, retrieved 2025-10-02
103. ↑ "#1596 - Avi Loeb". January 16, 2021. https://open.spotify.com/episode/0y7Vfzeua0TyLSAq3CUktH.
104. ↑ (in en) TFTRH #55: Avi Loeb and The Galileo Project, August 10, 2021, https://www.youtube.com/watch?v=VQqdgNG-rJg, retrieved 2021-11-08
105. ↑ (in en) Avi Loeb - Aliens, Black Holes & The End of the Universe - H3 Podcast #257, November 4, 2022, https://www.youtube.com/watch?v=gyBnTFJo7PM, retrieved 2022-11-04
106. ↑ From the First Star to Milkomeda, Abraham Loeb, Dror Burstein, Todd Hasak-Lowy, Noa Moav. Abraham Loeb. August 24, 2015.
107. ↑ "Opinion Essays by Abraham Loeb". March 18, 2018. https://www.cfa.harvard.edu/~loeb/Opinion.html.
108. ↑ "Avi Loeb". https://www.gf.org/fellows/all-fellows/avi-loeb/.
109. ↑ "The 25 Most Influential People in Space". https://www.cfa.harvard.edu/~loeb/TIME.pdf.
110. ↑ "PCAST_Members". https://science.osti.gov/About/PCAST/About/Members.

## External links

* Avi Loeb's home page
* Loeb's recent preprints
* Loeb's published papers
* Search for Interstellar Monuments (Avi Loeb; Scientific American; September 2021).
* Kloor, Keith (27 January 2023). "Why is a Harvard astrophysicist working with UFO buffs?" (in en). www.science.org. https://www.science.org/content/article/why-is-harvard-astrophysicist-working-with-ufo-buffs.

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