Planets
- Planets
Icy Orbs at the Solar System’s Edge
A ring at the solar system's outskirts appears to contain smaller objects than expected.
- Planets
A very distant planet says “cheese”
A small red spot may be the first picture ever taken of a planet outside the solar system.
- Planets
Planet Hunters Nab Three More
Astronomers have spotted three Neptune-size planets outside our solar system.
- Planets
Saturn’s New Moons
The Cassini spacecraft has found evidence of lightning and two tiny moons orbiting the ringed planet.
- Planets
Ringing Saturn
The Cassini spacecraft has arrived at Saturn to start exploring the planet and its rings and moons.
- Planets
Witnessing a Rare Venus Eclipse
On June 8, Venus will cross in front of the sun for the first time since 1882.
- Planets
Search for a Missing Moon
Sedna, the most distant object known in the solar system, doesn't appear to have a moon.
- Planets
Planets on the Edge
The discovery of a strange, planetlike object beyond Pluto adds to the puzzle of how the solar system formed.
- Planets
Rover Makes Splash on Mars
A robot on Mars has gathered evidence that liquid water once flowed on the Red Planet.
- Planets
Roving the Red Planet
Two little robots have touched down on Mars, ready to study the planet's rocks and soil.
- Planets
Catching a Comet’s Tail
A closeup visit by a NASA spacecraft helps show how a comet gets its shape.
- Earth
Killer space rock snuffed out ancient life
Rock fragments from Antarctica suggest a huge meteor struck Earth 250 million years ago.
