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 …
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 …
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 …
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 | 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 Depth | Enceladus – NASA Solar System Exploration
Oct 9, 2008 · From gravity measurements based on the Doppler effect and the magnitude of the moon’s very slight wobble as it orbits Saturn, scientists determined that the jets were being …
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 …
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 …
Europa By the Numbers – NASA Solar System Exploration
May 16, 2024 · Europa is one of the largest of Jupiter’s more than 90 moons. It's the sixth-closest moon to the planet.
In Depth | Saturn Moons – NASA Solar System Exploration
One object observed in the rings (and unofficially called Peggy) may be a moon forming or disintegrating, or it might not truly be a moon at all. Four spacecraft have visited the Saturn …