Cassini retirement
Retirement of NASA's Cassini spacecraft on 15 September 2017 / From Wikipedia, the free encyclopedia
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The Cassini space probe was deliberately disposed of via a controlled fall into Saturn's atmosphere on September 15, 2017, ending its nearly two-decade-long mission.[1][2][3][4] This method was chosen to prevent biological contamination of any of the moons of Saturn now thought to offer potentially habitable environments.[5] Factors that influenced the mission end method included the amount of rocket fuel left, the health of the spacecraft, and funding for operations on Earth.[6]
Some possibilities for Cassini's later stages were aerobraking into orbit around Titan,[6] leaving the Saturn system,[6] or making close approaches and/or changing its orbit.[6] For example, it could have collected solar wind data in a heliocentric orbit.[3]