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- 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
- Pluto By the Numbers - NASA Solar System Exploration
Pluto was once our solar system's ninth planet, but has been reclassified as a dwarf planet It's located in the Kuiper Belt
- In Depth | Ganymede – NASA Solar System Exploration
Jupiter’s moon Ganymede is proving to be a fascinating world Not only is it the largest moon in our solar system, bigger than the planet Mercury and the dwarf planet Pluto, but NASA’s Hubble Space Telescope has found the best evidence yet for an underground saltwater ocean on Ganymede The ocean is thought to have more water than all the water on Earth's surface Ganymede’s ocean is
- 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
- In Depth | Moons – NASA Solar System Exploration
Eris, another dwarf planet even more distant than Pluto, has a small moon of its own, named Dysnomia Haumea, another dwarf planet, has two satellites, Hi'iaka and Namaka
- Kuiper Belt and Oort Cloud - NASA Solar System Exploration
Instead, in 2006, the International Astronomical Union created a new class of objects called dwarf planet, and placed Pluto, Eris, and the asteroid Ceres in this category Subsequent discoveries added Haumea and Makemake to the dwarf planet family Pluto, Eris, Haumea, and Makemake retain their classifi-cation as KBOs (or TNOs)
- In Depth | Triton – NASA Solar System Exploration
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 captured by Neptune's gravity millions of years ago It shares many similarities with Pluto, the best known world of the Kuiper Belt
- NASA Solar System Exploration
NASA Solar System Exploration
- In Depth | Europa – NASA Solar System Exploration
This means Jupiter spins nearly upright so that the planet, as well as Europa and Jupiter’s other moons, do not have seasons like Earth Jupiter’s moons Io, Europa, and Ganymede are in what is called a resonance – every time Ganymede orbits Jupiter once, Europa orbits twice, and Io orbits four times
- In Depth | Sun – NASA Solar System Exploration
In Depth The Sun is a 4 5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star Without the Sun’s energy, life as we know it could not exist on our home planet
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