Planets
- 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.
- Planets
A planet from the early universe
Astronomers have found the oldest and most distant planet known in the universe.
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