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  • Solar Activity Heats Up

    Solar Activity Heats Up

    April 14, 2011

    No, it's not your imagination. Solar activity really is picking up, bringing an end to a century-class solar minimum.

  • Dawn Approaches Asteroid Vesta

    Dawn Approaches Asteroid Vesta

    April 7, 2011

    NASA's Dawn spacecraft has entered the asteroid belt and it is closing in on giant asteroid Vesta.

  • Spring is Fireball Season

    Spring is Fireball Season

    March 31, 2011

    For reasons researchers do not understand, the rate of midnight fireballs increases during the weeks around the vernal equinox. It's a beautiful display, but where do they come from? NASA's growing network of fireball cameras is scanning the heavens for answers.

  • Vesta--Is it Really an Asteroid?

    Vesta--Is it Really an Asteroid?

    March 29, 2011

    As NASA's Dawn spacecraft closes in on Vesta, researchers are wondering if the behemoth space rock is just an asteroid or something more?

  • Historic First: A Spacecraft Orbits Mercury

    Historic First: A Spacecraft Orbits Mercury

    March 18, 2011

    NASA’s MESSENGER spacecraft successfully achieved orbit around Mercury at approximately 9 p.m. EDT on March 17th. This marks the first time a spacecraft has orbited the solar system's innermost planet.

  • Super Full Moon

    Super Full Moon

    March 16, 2011

    On March 19th, a full Moon of rare size and beauty will rise in the east at sunset. It's a super "perigee moon"--the biggest in almost 20 years.

  • Finally! NASA Prepares to Orbit Mercury

    Finally! NASA Prepares to Orbit Mercury

    March 15, 2011

    It's not easy to visit Mercury, but NASA is about to settle in for a long stay. The MESSENGER probe enters orbit around the innermost planet on March 17th.

  • See Mercury at Sunset

    See Mercury at Sunset

    March 14, 2011

    This week, sky watchers have a rare opportunity to see Mercury at its best as NASA's MESSENGER probe prepares to enter orbit around the innermost planet.

  • Researchers Crack the Mystery of the Missing Sunspots

    Researchers Crack the Mystery of the Missing Sunspots

    March 2, 2011

    When solar activity recently plunged into a century-class minimum, many experts were puzzled. Now a group of researchers say they have cracked the mystery of the missing sunspots.

  • What's Hitting Earth?

    What's Hitting Earth?

    March 1, 2011

    Have you ever seen a fireball streak through the night sky and gone to bed wondering, "What was that?" NASA is deploying a network of smart cameras that could have an answer waiting for you when you wake up.