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  1. nasa.gov
    https://solarsystem.nasa.gov › moons › neptune-moons › proteus › in-depth.amp

    In Depth | Proteus – NASA Solar System Exploration

    Overview Proteus is one of the largest of Neptune's known moons, although it is not as big as Triton. The moon has an odd box-like shape and if it had just a little more mass it would be able to transform …

  2. nasa.gov
    https://solarsystem.nasa.gov › planet-compare

    Planet Compare – NASA Solar System Exploration

    Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

  3. nasa.gov
    https://solarsystem.nasa.gov › moons › neptune-moons › in-depth.amp

    In Depth | Neptune Moons – NASA Solar System Exploration

    Dutch-American astronomer Gerard Kuiper (for whom the Kuiper Belt was named) found Neptune's third-largest moon, Nereid, in 1949. He missed Proteus, the second-largest because it's too dark and …

  4. nasa.gov
    https://solarsystem.nasa.gov

    RPS 3D Viewer - NASA Solar System Exploration

    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 & …

  5. nasa.gov
    https://solarsystem.nasa.gov › gltf_embed

    Neptune 3D Model – NASA Solar System Exploration

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  6. nasa.gov
    https://solarsystem.nasa.gov › solar-system › our-solar-system › in-depth.amp

    In Depth | Our Solar System – NASA Solar System Exploration

    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; …

  7. nasa.gov
    https://solarsystem.nasa.gov › internal_resources
    [PDF]

    Kuiper Belt and Oort Cloud - NASA Solar System Exploration

    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 …

  8. nasa.gov
    https://solarsystem.nasa.gov › bibliography

    Bibliography - NASA Solar System Exploration

    Apr 23, 2024 · Scott S. Sheppard's Neptune's Known Satellites Page: http://www.dtm.ciw.edu/users/sheppard/satellites/nepsatdata.html Scott S. Sheppard's Pluto's Known …

  9. nasa.gov
    https://solarsystem.nasa.gov › psyche_images

    Psyche Raw Image: Imager A - NASA Solar System Exploration

    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

  10. nasa.gov
    https://solarsystem.nasa.gov › mars-by-the-numbers

    Mars By the Numbers - NASA Solar System Exploration

    Oct 21, 2025 · Mars is the fourth planet from the Sun, and the seventh largest. It’s the only planet we know of inhabited entirely by robots.