Neptune's orbit was the farthest out, and its gravity bent the paths of countless icy bodies inward toward the other giants. dtm. Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. You are using an outdated browser. Proteus orbits Neptune about every 27 hours. html Dutch-American astronomer Gerard Kuiper (for whom the Kuiper Belt was named) found Neptune's third-largest moon, Nereid, in 1949. Oct 21, 2025 · Moons About Moons BY DESTINATION Earth (1) Mars (2) Jupiter (95) Saturn (83) Uranus (27) Neptune (14) Pluto (5) Asteroids, Comets & Meteors About Asteroids, Comets & Meteors BY TYPE Oct 21, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. edu/users/sheppard/satellites/plutosatdata. Please upgrade your browser to improve your experience. He missed Proteus, the second-largest because it's too dark and too close to Neptune for telescopes of that era. edu/users/sheppard/satellites/nepsatdata. Moons About Moons BY DESTINATION Earth (1) Mars (2) Jupiter (95) Saturn (83) Uranus (27) Neptune (14) Pluto (5) Asteroids, Comets & Meteors About Asteroids, Comets & Meteors BY TYPE In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As Uranus and Neptune drifted farther outward, they passed through the dense disk of small, icy bodies left over after the giant planets formed. Oct 21, 2025 · Moons About Moons BY DESTINATION Earth (1) Mars (2) Jupiter (95) Saturn (83) Uranus (27) Neptune (14) Pluto (5) Asteroids, Comets & Meteors About Asteroids, Comets & Meteors BY TYPE Overview Proteus is one of the largest of Neptune's known moons, although it is not as big as Triton. Sheppard's Pluto's Known Satellites Page: http://home. html Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids. Oct 21, 2025 · Moons About Moons BY DESTINATION Earth (1) Mars (2) Jupiter (95) Saturn (83) Uranus (27) Neptune (14) Pluto (5) Asteroids, Comets & Meteors About Asteroids, Comets & Meteors BY TYPE You are using an outdated browser. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields. The moon has an odd box-like shape and if it had just a little more mass it would be able to transform into a sphere. In 1943, astronomer Kenneth Edgeworth hypothesized that many small, icy bodies exist in a disc in the region beyond Neptune, having condensed from widely spaced ancient material, and that from time to time one of them visits the inner solar system. Our scientists and far-ranging robots explore the wild frontiers of our solar system. ciw. html Scott S. Overview Proteus is one of the largest of Neptune's known moons, although it is not as big as Triton. . Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Sheppard's Neptune's Known Satellites Page: http://www. Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids. Apr 23, 2024 · Scott S. It’s the only planet we know of inhabited entirely by robots.

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