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  2. Subsatellite - Wikipedia

    en.wikipedia.org/wiki/Subsatellite

    A subsatellite, also known as a submoon or informally a moonmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet. [3] It is inferred from the empirical study of natural satellites in the Solar System that subsatellites may be rare, albeit possible, elements of planetary systems. In the Solar System ...

  3. Lunar orbit - Wikipedia

    en.wikipedia.org/wiki/Lunar_orbit

    Orion capsule of Artemis 1 above the Moon in December 2022. In astronomy and spaceflight, a lunar orbit (also known as a selenocentric orbit) is an orbit by an object around Earth's Moon. In general these orbits are not circular. When farthest from the Moon (at apoapsis) a spacecraft is said to be at apolune, apocynthion, or aposelene.

  4. List of natural satellites - Wikipedia

    en.wikipedia.org/wiki/List_of_natural_satellites

    Irregular moons are probably minor planets that have been captured from surrounding space. Most irregular moons are less than 10 kilometres (6.2 mi) in diameter. The earliest published discovery of a moon other than Earth's was by Galileo Galilei, who discovered the four Galilean moons orbiting Jupiter in 1610. Over the following three ...

  5. Natural satellite - Wikipedia

    en.wikipedia.org/wiki/Natural_satellite

    The seven largest natural satellites in the Solar System (those bigger than 2,500 km across) are Jupiter's Galilean moons (Ganymede, Callisto, Io, and Europa), Saturn's moon Titan, Earth's moon, and Neptune's captured natural satellite Triton. Triton, the smallest of these, has more mass than all smaller natural satellites together.

  6. List of missions to the Moon - Wikipedia

    en.wikipedia.org/wiki/List_of_missions_to_the_Moon

    Intended to orbit the Moon and return to Earth. All first-stage engines shut down 10 seconds after launch; launch vehicle crashed and exploded on the launch pad. Spacecraft landed safely 2 kilometres (1.2 mi) from the launch site after using launch escape sequence. [68] 71: Luna 15 (E-8-5 No.401) Luna 15: 13 July 1969: Proton-K/D: Lavochkin: Lander

  7. List of missions to the outer planets - Wikipedia

    en.wikipedia.org/wiki/List_of_missions_to_the...

    Montage of planets and some moons that the two Voyager spacecraft have visited and studied. It is the only program that visited all four outer planets. A total of nine spacecraft have been launched on missions that involve visits to the outer planets; all nine missions involve encounters with Jupiter, with four spacecraft also visiting Saturn.

  8. Moon - Wikipedia

    en.wikipedia.org/wiki/Moon

    The Moon is Earth's only natural satellite.It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period at 29.5 Earth days, causing the same side of the Moon to always face Earth.

  9. Artemis program - Wikipedia

    en.wikipedia.org/wiki/Artemis_program

    The Artemis program is a Moon exploration program led by the United States' National Aeronautics and Space Administration (NASA), formally established in 2017 via Space Policy Directive 1. It is intended to reestablish a human presence on the Moon for the first time since the Apollo 17 mission in 1972.

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