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  2. Moon - Wikipedia

    en.wikipedia.org/wiki/Moon

    The Moon is by size and mass the fifth largest natural satellite of the Solar System, categorizable as one of its planetary-mass moons, making it a satellite planet under the geophysical definitions of the term. [17] It is smaller than Mercury and considerably larger than the largest dwarf planet of the Solar System, Pluto.

  3. Claimed moons of Earth - Wikipedia

    en.wikipedia.org/wiki/Claimed_moons_of_Earth

    Claimed moons of Earth. This asteroid's orbit keeps it near the Earth, but not orbiting it in the usual sense. When analyzing its orbit from the perspective of different bodies, the presumed quasi-satellite does seem to have a more stable location near the Earth. The orbit of 2020 CD 3 around the Earth. The white band is the orbit of the Moon.

  4. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    720,000 km/h (450,000 mi/h) [10] Orbital period. ~230 million years [10] The Solar System[d] is the gravitationally bound system of the Sun and the objects that orbit it. [11] It was formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.

  5. 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 ...

  6. Titan (moon) - Wikipedia

    en.wikipedia.org/wiki/Titan_(moon)

    Titan is one of seven gravitationally rounded moons of Saturn and the second-most distant among them. Frequently described as a planet-like moon, Titan is 50% larger in diameter than Earth's Moon and 80% more massive. It is the second-largest moon in the Solar System after Jupiter's Ganymede and is larger than Mercury; yet Titan is only 40% as ...

  7. Callisto (moon) - Wikipedia

    en.wikipedia.org/wiki/Callisto_(moon)

    Callisto (moon) Surface temp. Callisto (/ kəˈlɪstoʊ / kə-LIST-oh), or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. In the Solar System it is the third-largest moon after Ganymede and Saturn 's largest moon Titan, and nearly as large as the smallest planet Mercury. Callisto is, with a diameter of 4,821 km, roughly a ...

  8. Lunar observation - Wikipedia

    en.wikipedia.org/wiki/Lunar_observation

    Lunar observation. The waxing gibbous Moon as viewed from Earth. The Moon is the largest natural satellite of and the closest major astronomical object to Earth. The Moon may be observed by using a variety of optical instruments, ranging from the naked eye to large telescopes. The Moon is the only celestial body upon which surface features can ...

  9. Hollow Moon - Wikipedia

    en.wikipedia.org/wiki/Hollow_Moon

    The Hollow Moon and the closely related Spaceship Moon are pseudoscientific hypotheses that propose that Earth's Moon is either wholly hollow or otherwise contains a substantial interior space. No scientific evidence exists to support the idea; seismic observations and other data collected since spacecraft began to orbit or land on the Moon ...