1. Space

    Burst busters

    A powerful type of explosion in outer space is much more common, but not always as powerful, as astronomers had thought.

  2. Planets

    Ringing Saturn

    The Cassini spacecraft has arrived at Saturn to start exploring the planet and its rings and moons.

  3. Planets

    Witnessing a Rare Venus Eclipse

    On June 8, Venus will cross in front of the sun for the first time since 1882.

  4. Space

    Older Stars, New Age for the Universe

    The oldest stars appear to be about a billion years older than astronomers had estimated.

  5. Planets

    Search for a Missing Moon

    Sedna, the most distant object known in the solar system, doesn't appear to have a moon.

  6. Planets

    Planets on the Edge

    The discovery of a strange, planetlike object beyond Pluto adds to the puzzle of how the solar system formed.

  7. Space

    Destination Mars

    Sending mice into space is just one step toward putting astronauts on Mars.

  8. Planets

    Rover Makes Splash on Mars

    A robot on Mars has gathered evidence that liquid water once flowed on the Red Planet.

  9. Space

    Strange Universe: The Stuff of Darkness

    Figuring out what's hidden in outer space between the visible stars and galaxies isn't easy.

  10. Planets

    Roving the Red Planet

    Two little robots have touched down on Mars, ready to study the planet's rocks and soil.

  11. Planets

    Catching a Comet’s Tail

    A closeup visit by a NASA spacecraft helps show how a comet gets its shape.

  12. Space

    Sun Flips Out to Flip-Flop

    The sun may reverse its magnetic field by blasting charged particles into space.