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  2. Neptune - Wikipedia

    en.wikipedia.org/wiki/Neptune

    The Kuiper belt is a ring of small icy worlds, similar to the asteroid belt but far larger, extending from Neptune's orbit at 30 AU out to about 55 AU from the Sun. [145] Much in the same way that Jupiter's gravity dominates the asteroid belt, Neptune's gravity dominates the Kuiper belt. Over the age of the Solar System, certain regions of the ...

  3. Surface gravity - Wikipedia

    en.wikipedia.org/wiki/Surface_gravity

    For gas giant planets such as Jupiter, Saturn, Uranus, and Neptune, the surface gravity is given at the 1 bar pressure level in the atmosphere. [12] It has been found that for giant planets with masses in the range up to 100 times Earth's mass, their gravity surface is nevertheless very similar and close to 1 g, a region named the gravity ...

  4. List of gravitationally rounded objects of the Solar System

    en.wikipedia.org/wiki/List_of_gravitationally...

    ^ Surface gravity derived from the mass m, the gravitational constant G and the radius r: Gm/r 2. ^ Escape velocity derived from the mass m, the gravitational constant G and the radius r: √ (2Gm)/r. ^ Orbital speed is calculated using the mean orbital radius and the orbital period, assuming a circular orbit. ^ Assuming a density of 2.0

  5. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    There has not yet been an orbiter around Uranus or Neptune for long-term study of their moons. ... Surface area Density Gravity [note 3] Type Discovery

  6. Triton (moon) - Wikipedia

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

    Triton orbits Neptune in a retrograde orbit—revolving in the opposite direction to the parent planet's rotation—the only large moon in the Solar System to do so. [3] [13] Triton is thought to have once been a dwarf planet from the Kuiper belt, captured into Neptune's orbit by the latter's gravity. [14]

  7. Sphere of influence (astrodynamics) - Wikipedia

    en.wikipedia.org/wiki/Sphere_of_influence_(astro...

    Surface gravity; Specific orbital energy; ... Neptune, its Primary SOI is much smaller due to Jupiter's much closer proximity to the Sun. ... Gravity well is a ...

  8. Proteus (moon) - Wikipedia

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

    Proteus (/ ˈ p r oʊ t i ə s / PROH-tee-əs), also known as Neptune VIII, is the second-largest Neptunian moon, and Neptune's largest inner satellite. Discovered by Voyager 2 in 1989, it is named after Proteus , the shape-changing sea god of Greek mythology . [ 11 ]

  9. Nereid (moon) - Wikipedia

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

    Surface gravity. ≈0.075 m/s 2 ... Nereid, or Neptune II, is the third-largest moon of Neptune. It has the most eccentric orbit of all known moons in the Solar ...