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  2. 2020 in spaceflight - Wikipedia

    en.wikipedia.org/wiki/2020_in_spaceflight

    In April 2020, MEV-1 successfully brought Intelsat-901 it back to position in geosynchronous orbit where it is now expected to operate for another five years. This was a space industry first as satellite servicing had previously been accomplished only with on-orbit human assistance, during the missions to service the Hubble Space Telescope in ...

  3. 2020s in spaceflight - Wikipedia

    en.wikipedia.org/wiki/2020s_in_spaceflight

    NASA's Mars 2020 mission, which includes the Perseverance rover, was successfully launched on 30 July 2020 to study the habitability of Mars in preparation for future human missions. [12] The Chang'e 5 successfully landed on the surface of the Moon in 2020. [13] 16 September 2021, SpaceX launched Inspiration4.

  4. Space debris - Wikipedia

    en.wikipedia.org/wiki/Space_debris

    To date in 2019, removal costs and legal questions about ownership and the authority to remove defunct satellites have stymied national or international action. Current space law retains ownership of all satellites with their original operators, even debris or spacecraft which are defunct or threaten active missions. [196]

  5. List of artificial objects leaving the Solar System - Wikipedia

    en.wikipedia.org/wiki/List_of_artificial_objects...

    The probe passed the heliopause at 121 AU on August 25, 2012, to enter interstellar space. [7] Voyager 1 is still active. In about 40,000 years the star Gliese 445 (AC +79 3888) and the Sun will fly past each other at a distance of 3.45 light-years, after being currently 17.6 light-years from each other, [ 8 ] with Voyager 1 coming as close as ...

  6. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Since 2003, Jean-Pierre Luminet, et al., and other groups have suggested that the shape of the universe may be the Poincaré dodecahedral space. Is the shape unmeasurable, the Poincaré space, or another 3-manifold? Cosmic inflation: Is the theory of cosmic inflation in the very early universe correct? If so, what are the details of this epoch?

  7. List of crewed spacecraft - Wikipedia

    en.wikipedia.org/wiki/List_of_crewed_spacecraft

    Apollo 11 Lunar Module Eagle was the first crewed spacecraft to land on the Moon (July 20, 1969).. This is a list of all crewed spacecraft types that have flown into space, including sub-orbital flights above 80 km, space stations that have been visited by at least one crew, and spacecraft currently planned to operate with crews in the future. [1]

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  9. Twenty questions - Wikipedia

    en.wikipedia.org/wiki/Twenty_questions

    Twentynine questions is a spoken parlor game which encourages deductive reasoning and creativity. It originated in the United States and was played widely in the 19th century. [ 1 ] It escalated in popularity during the late 1940s, when it became the format for a successful weekly radio quiz program.