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In Depth | Proteus – NASA Solar System Exploration Discovery Proteus was discovered in 1989 by the Voyager 2 spacecraft This is unusual since a smaller moon, Nereid, was discovered 33 years earlier using an Earth-based telescope Proteus was most likely overlooked because it is so dark and the distance between Earth and Neptune is so great Overview Proteus is one of the largest of Neptune's known moons, although it is not as big as Triton
Planet Compare - NASA Solar System Exploration NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
RPS 3D Viewer - NASA Solar System Exploration NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
In Depth | Triton – NASA Solar System Exploration Discovery Triton was discovered on Oct 10, 1846 by British astronomer William Lassell, just 17 days after Neptune itself was discovered Overview Triton is the largest of Neptune's 13 moons It is unusual because it is the only large moon in our solar system that orbits in the opposite direction of its planet's rotation―a retrograde orbit Scientists think Triton is a Kuiper Belt Object
In Depth | Our Solar System – NASA Solar System Exploration The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy 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 Beyond our own solar system, there
In Depth | Kuiper Belt – NASA Solar System Exploration The Kuiper Belt is a large region in the cold, outer reaches of our solar system beyond the orbit of Neptune It's sometimes called the "third zone" of the solar system Astronomers think there are millions of small, icy objects in this region – including hundreds of thousands that are larger than 60 miles (100 kilometers) wide Some of the objects, including Pluto, are over 600 miles (1,000
In Depth | Moons – NASA Solar System Exploration NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
Directory - NASA Solar System Exploration NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
Kuiper Belt and Oort Cloud - NASA Solar System Exploration The Kuiper Belt should not be confused with the Oort Cloud, which is a thousand times more distant In 1950, astronomer Jan Oort proposed that certain comets come from a vast, extremely distant spherical shell of icy bodies surrounding the solar system This giant swarm of objects, now named the Oort Cloud, occupies space at a distance between 5,000 and 100,000 astronomical units No objects