Space
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Planets
Roving the Red Planet
Two little robots have touched down on Mars, ready to study the planet's rocks and soil.
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Planets
Catching a Comet’s Tail
A closeup visit by a NASA spacecraft helps show how a comet gets its shape.
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Space
Sun Flips Out to Flip-Flop
The sun may reverse its magnetic field by blasting charged particles into space.
By Emily Sohn -
Earth
Killer space rock snuffed out ancient life
Rock fragments from Antarctica suggest a huge meteor struck Earth 250 million years ago.
By Emily Sohn -
Space
Asteroid lost and found
A long-lost asteroid that came close to Earth in 1937 has been spotted again.
By Emily Sohn -
Space
The Mirror Universe of Antimatter
Scientists are creating particles of antimatter to learn why the universe has so few.
By Emily Sohn -
Space
Dreams of floating in space
Traveling into outer space is scary, fun, and a possibility for anyone who's willing to work hard enough to get there.
By Emily Sohn -
Space
Tossing Out a Black Hole Life Preserver
A ring of matter would keep you alive longer as you get swallowed by a black hole.
By Emily Sohn -
Space
Intruder Alert: Sweeping Space for Dust
The solar system is filling up with stardust three times faster than it was 6 years ago.
By Emily Sohn -
Space
Big galaxy swallows little galaxy
Astronomers find a convincing case of a large galaxy caught in the act of eating a smaller one.
By Emily Sohn -
Space
Sky Dust Keeps Falling on Your Head
Dust raining down from space and Earth's atmosphere provides information about weather patterns, pollution, and the origin of the universe.
By Emily Sohn -
Planets
A planet from the early universe
Astronomers have found the oldest and most distant planet known in the universe.
By Emily Sohn