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1. Oort cloud: The Oort cloud, alternatively termed the Öpik-Oort cloud, is a hypothetical spherical cloud of comets situated about 50,000 to 100,000 astronomical unit (AU) from the Sun. This is approximately two thousand times the distance from the Sun ... [100%] 2023-02-04
2. Oort cloud: The Oort cloud (/ɔːrt, ʊərt/), sometimes called the Öpik–Oort cloud, first described in 1950 by the Dutch astronomer Jan Oort, is a theoretical concept of a cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging ... (Astronomy) [100%] 2022-02-20 [Oort cloud] [Astronomical hypotheses]...
3. Oort cloud: The Oort cloud is the hypothetical region, said to be 50,000 to 100,000 AU in radius, that contains many billions of comets in orbit around the Sun. It is the supposed source of all observed long-period comets ... [100%] 2023-02-16 [Astronomy]
4. Oort cloud: The Oort cloud (/ɔːrt, ʊərt/), sometimes called the Öpik–Oort cloud, is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light ... (Distant planetesimals in the Solar System) [100%] 2024-04-02 [Oort cloud] [Astronomical hypotheses]...
5. Oort cloud radiation astronomy: Editor-In-Chief: Henry A. Hoff The Oort cloud or the Öpik–Oort cloud is a hypothesized spherical cloud of comets which may lie roughly 50,000 AU, or nearly a light-year, from the Sun. [70%] 2023-06-02 [Radiation astronomy/Lectures] [Resources last modified in October 2019]...