In Depth | Earth's Moon – NASA Solar System Exploration
Earth's Moon is the only place beyond Earth where humans have set foot, so far. Earth's only natural satellite is simply called "the Moon" because people didn't know other moons existed until Galileo …
By the Numbers | Earth's Moon – NASA Solar System Exploration
The distance from the center of an object to its equator. The outer or uppermost part of a planet, moon, asteroid, comet or other body. The gravitational acceleration experienced at its surface at the …
In Depth | Moons – NASA Solar System Exploration
Twelve American astronauts landed on the Moon during NASA's Apollo program from 1969 to 1972, studying the Moon and bringing back rock samples. Usually the term moon brings to mind a …
Pluto By the Numbers - NASA Solar System Exploration
Oct 21, 2025 · SURFACE AREA The outer or uppermost part of a planet, moon, asteroid, comet or other body. 6,427,806 square miles 196,936,994 square miles
In Depth | Enceladus – NASA Solar System Exploration
Oct 9, 2008 · Enceladus orbits Saturn twice every time Dione, a larger moon, orbits once. Dione’s gravity stretches Enceladus’ orbit into an elliptical shape, so Enceladus is sometimes closer and …
In Depth | Ganymede – NASA Solar System Exploration
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 …
In Depth | Europa – NASA Solar System Exploration
With an equatorial diameter of 1,940 miles (3,100 kilometers), Europa is about 90% the size of Earth’s Moon. So if we replaced our Moon with Europa, it would appear roughly the same size in the sky as …
Earth's Moon 3D Model – NASA Solar System Exploration
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Europa By the Numbers - NASA Solar System Exploration
Oct 21, 2025 · Europa is one of the largest of Jupiter’s more than 90 moons. It's the sixth-closest moon to the planet.
In Depth | Titan – NASA Solar System Exploration
Titan is bigger than Earth's moon, and larger than even the planet Mercury. This mammoth moon is the only moon in the solar system with a dense atmosphere, and it’s the only world besides Earth that …