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This is a list of artificial objects reentering Earth's atmosphere by mass (see space debris). Such objects are often completely destroyed by reentry heating, but large enough objects or components can survive. Most of the objects which reenter are relatively small; larger objects have survived but usually break up into smaller pieces during reentry.[1][2][3]
The list includes group entries for the 134 Space Shuttle external tanks used between 1981 and 2011. During Space Shuttle launches, the tanks reached space without reaching orbit and re-entered the atmosphere, breaking apart before impacting the ocean. The mass of those tanks varied throughout the years, as improvements made them lighter - successive modifications reduced their empty weight from approximately 77,000 pounds (35,000 kg) to approximately 58,500 lb (26,500 kg) for the Super Lightweight Tank used after 1998.[4] The tanks were also not necessarily completely empty when discarded.[5]
Many other launch systems have discarded spent stages into space, but not all stages go into orbit or even reach space (by passing the Kármán line). For example, the Space Shuttle side boosters did not reach space, as the highest altitude reached during their flight was only about 220,000 feet (67 km).
| Object | Owner | Mass | Reentry Date | Age[6] | Reentry type | Launch Date[6][7] |
|---|---|---|---|---|---|---|
| Mir | Russia | 120,000 kg (260,000 lb) | 2001-03-23 | Template:Age for infant | Controlled | 20 February 1986 |
| Skylab[3] | USA | 69,000 kg (152,000 lb) | 1979-07-11 | Template:Age for infant | Partially Controlled | 14 May 1973 |
| Salyut 7/Cosmos 1686 | USSR | 40,000 kg (88,000 lb) | 1991-02-07 | Template:Age for infant | Uncontrolled | 13 May 1982 |
| S-II Stage / Skylab | USA | 36,200 kg (79,700 lb) | 11 January 1975 | 18 Months | Uncontrolled | 14 May 1973 |
| STS external tank (Standard Tank) | USA | 35,000 kg (77,000 lb) and remaining propellants | 1981 (1981–83) | Partially Controlled | ||
| Salyut 6/Cosmos 1267 | USSR | 35,000 kg (77,000 lb) | 1982-07-29 | Template:Age for infant | Controlled | 29 September 1977 |
| STS external tank (Lightweight Tank) | USA | 30,000 kg (66,000 lb) and remaining propellants | 1983 (1983–98) | Partially Controlled | 1981-2011 | |
| Long March 5B core (5B-Y1 flight) | China | 21,600 kg (47,600 lb) | 2020-05-11 | 6 days | Uncontrolled | 5 May 2020 |
| Long March 5B core (5B-Y2 flight) | China | 21,600 kg (47,600 lb) | 2021-05-09[8] | 9 days | Uncontrolled | 29 April 2021 |
| Cosmos 557 | USSR | 19,400 kg (42,800 lb) | 1973-05-22 | Template:Age for infant | Uncontrolled | 11 May 1973 |
| Salyut 5 | USSR | 19,000 kg (42,000 lb) | 1977-08-08 | Template:Age for infant | Controlled | 2 June 1976 |
| Salyut 1 | USSR | 18,900 kg (41,700 lb) | 1971-10-11 | Template:Age for infant | Controlled | 19 April 1971 |
| Salyut 3 | USSR | 18,900 kg (41,700 lb) | 1975-01-24 | Template:Age for infant | Controlled | 25 June 1974 |
| Salyut 4 | USSR | 18,900 kg (41,700 lb) | 1977-02-02 | Template:Age for infant | Controlled | 26 December 1974 |
| Apollo SA-5 Nose Cone | USA | 17,100 kg (37,700 lb) | 1966-04-30 | Template:Age for infant | Uncontrolled | 29 January 1964 |
| Apollo SA-6 CSM BP-13 | USA | 16,900 kg (37,300 lb) | 1964-06-01 | Template:Age for infant | Uncontrolled | 28 May 1964 |
| Apollo SA-7 CSM BP-15 | USA | 16,650 kg (36,710 lb) | 1964-09-22 | Template:Age for infant | Uncontrolled | 18 September 1964 |
| Cosmos 929 | USSR | 15,000 kg (33,000 lb) | 1978-02-02 | Template:Age for infant | Controlled | 17 July 1977 |
| Cosmos 1443 | USSR | 15,000 kg (33,000 lb) | 1983-09-19 | Template:Age for infant | Controlled | 2 March 1983 |
| CGRO[3] | USA | 14,910 kg (32,870 lb) | 2000-06-04 | Template:Age for infant | Controlled | 5 April 1991 |
| Phobos-Grunt[9] | Russia | 13,500 kg (29,800 lb) | 2012-01-15 | Template:Age for infant | Uncontrolled | 9 November 2011 |
| Pegasus 1 | USA | 10,297 kg (22,701 lb) [10] | 1978-09-17[11] | Template:Age for infant | Uncontrolled | 16 February 1965 |
| Pegasus 2 | USA | 9,058 kg (19,969 lb)[10] | 1979-11-03[11] | Template:Age for infant | Uncontrolled | 25 May 1965 |
| Tiangong-1 | China | 8,506 kg (18,753 lb) | 2018-04-02[12] | Template:Age for infant | Uncontrolled | 29 Sep 2011 |
| UARS[13] | NASA | 5,900 kg (13,000 lb) | 24 September 2011 | Template:Age for infant | Uncontrolled | 12 September 1991 |
| ROSAT[14] | DLR | 2,400 kg (5,300 lb) | 2011-10-23 | Template:Age for infant | Uncontrolled | 1 June 1990 |
Categories: [Space debris] [Satellites formerly orbiting Earth] [Atmospheric entry] [Space lists]
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