1. Earth

    Killer space rock snuffed out ancient life

    Rock fragments from Antarctica suggest a huge meteor struck Earth 250 million years ago.

  2. Space

    Asteroid lost and found

    A long-lost asteroid that came close to Earth in 1937 has been spotted again.

  3. Space

    The Mirror Universe of Antimatter

    Scientists are creating particles of antimatter to learn why the universe has so few.

  4. 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.

  5. 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.

  6. Space

    Intruder Alert: Sweeping Space for Dust

    The solar system is filling up with stardust three times faster than it was 6 years ago.

  7. Space

    Big galaxy swallows little galaxy

    Astronomers find a convincing case of a large galaxy caught in the act of eating a smaller one.

  8. 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.

  9. Planets

    A planet from the early universe

    Astronomers have found the oldest and most distant planet known in the universe.

  10. Planets

    Melting Snow on Mars

    Melting blankets of snow may have carved out Martian gullies.

  11. Space

    Zooming In on the Wild Sun

    A close look at the sun reveals a chaotic, ever-changing surface.

  12. Space

    Phantom Energy and the Big Rip

    Weird stuff called dark energy could push the universe toward a runaway expansion and ultimate demise about 21 billion years from now.