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  • The Cabeus crater on the moon.

    Moon Water Linked to Silver?

    The moon's south pole hosts unexpected amounts of silver and mercury, which may help reveal the origins of lunar water.

  • Picture of a spiral galaxy seen face-on.

    Space Photos This Week

    Hubble's latest "pinwheel," a new view of a solar eclipse, and a Saturn moon "road trip" are among the week's best space photos.

  • The approximate location of a newfound, most distant galaxy is shown.

    Most Distant Object Found

    A galaxy that existed 600 million years after the big bang may help explain why the gases in "empty" space are transparent, experts say.

  • Picture of

    Photos: Green Comet Nears Earth

    Visible with binoculars, comet Hartley 2 will make its closest pass by Earth this week since its discovery in 1986, astronomers say.

  • The moon Iapetus.

    Saturn Moon Mystery Solved?

    Saturn's moon Iapetus spun unusually fast in its youth, creating the eight-mile-high ridge around its middle, scientists suggest.

  • Satellite picture of a toxic sludge spill in Hungary.

    Space Photos This Week

    Hungary's spill spied from above, galaxies getting cold meals, and gases blown off the sun are among the week's best space pictures.

  • The asteroid Itokawa.

    Bomb "Killer" Asteroids, Experts Say

    Blowing up oncoming space rocks might not, as feared, make a bad situation worse or require impossibly big bombs, new studies suggest.

  • An illustration of a primordial quasar.

    Black Holes Scorched Early Universe

    Monster galaxies with supermassive black hole hearts released fierce blasts that superheated the universe about 11 billion years ago, a new study says.

  • Picture of explorers in Mexico's giant Cave of Crystals

    Return to Giant Crystal Cave

    It looks like Superman's fortress and is nearly as hard to get into, but that hasn't kept explorers from uncovering new secrets in and around Mexico's deep, deadly Cave of Crystals.

  • Sunlight glints off Kraken Mare, a lake on Titan's northern hemisphere, in a July 2009 Cassini spacecraft picture.

    Titan Has Ingredients for Life?

    The chemical "letters" used to write the basic code for life on Earth might exist on Saturn's largest moon, according to new laboratory research presented Thursday.

  • A stellar nursery is shown in an infrared picture.

    Space Photos This Week

    Atmospheric circles above France, a meteor on Mars, and a catalog of Earth's most threatening neighbors—all in the week's top space pictures.

  • The comet Giacobini-Zinner, source of the Draconids meteor shower.

    Meteor Shower Thursday

    Tonight's Draconids meteor shower forecast calls for no more than a drizzle. But next year, sky-watchers should be prepared for a downpour.

  • A false-color image of Saturn's rings.

    "Tsunamis" Detected in Saturn Ring

    The gravitational pull of Saturn's largest moon, Titan, may be causing monster waves of ice in one of the planet's rings.

  • The sun, seen in ultraviolet light.

    Sun's Climate Impact Overestimated?

    A decline in the sun's activity may warm, not cool Earth—suggesting sun's role in climate change is more complicated than thought, scientists say.

  • Aurora borealis, as seen by the cameras of the All-Sky Imager network of the NASA THEMIS mission.

    Pulsating Aurorae Secrets Revealed

    Pulsating aurorae, the most striking type of northern lights, are triggered by an electromagnetic wave, scientists have announced.

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