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A ring at the solar system's outskirts appears to contain smaller objects than expected.
A small red spot may be the first picture ever taken of a planet outside the solar system.
Astronomers have spotted three Neptune-size planets outside our solar system.
The Cassini spacecraft has found evidence of lightning and two tiny moons orbiting the ringed planet.
The Cassini spacecraft has arrived at Saturn to start exploring the planet and its rings and moons.
On June 8, Venus will cross in front of the sun for the first time since 1882.
Sedna, the most distant object known in the solar system, doesn't appear to have a moon.
The discovery of a strange, planetlike object beyond Pluto adds to the puzzle of how the solar system formed.
A robot on Mars has gathered evidence that liquid water once flowed on the Red Planet.
Two little robots have touched down on Mars, ready to study the planet's rocks and soil.
A closeup visit by a NASA spacecraft helps show how a comet gets its shape.
Rock fragments from Antarctica suggest a huge meteor struck Earth 250 million years ago.