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  • Summer Moon Illusion

    June 24, 2002

    Summer is a good time to spot giant moons near the horizon. It's the season for the mysterious moon illusion.

  • In Search of E.T.'s Breath

    Jan. 10, 2002

    Astronomers are discovering new worlds outside our solar system at a dizzying pace. Do any of them harbor alien life? No one knows, yet...

  • Vanishing Saturn

    Feb. 19, 2002

    The ringed planet will vanish behind Earth's moon on Wednesday, Feb. 20th. Some astronomers will be watching carefully for the faint glow of Saturn's "lost ring."

  • A Shocking Space Movie

    Sept. 19, 2002

    Astronomers have captured extraordinary footage of a Manhattan-sized star rotating and spewing antimatter jets into space.

  • Hitchhiker's Guide to an Asteroid

    April 5, 2002

    Learning what near-Earth Asteroidsare made of and how they're put together is simply prudent. NASA's NEAR spacecraft got a closer look at one when it landed on 433 Eros in 2001.

  • The Edge of Sunshine

    Jan. 8, 2002

    Solar energy is an abundant source of power for spacecraft navigating the inner solar system. But how far away from our star can photovoltaics work?

  • How do Photovoltaics Work?

    Aug. 6, 2008

  • Easing off the (Greenhouse) Gas

    Jan. 15, 2002

    Greenhouse gases are still accumulating in Earth's atmosphere, but more slowly than before, say NASA-funded researchers.

  • Unveiling Planet Ocean

    March 14, 2002

    NASA's GRACE mission will reveal some of what lies hidden beneath the surface of Earth's oceans by measuring tiny changes in gravity.

  • Silicon Sidekicks

    Sept. 13, 2002

    NASA's successful Sojouner Mars rover had the computing power of a cricket, more or less. Researchers say we'll have to do better than that if we're serious about exploring the solar system. This story describes the emerging new technologies of smart Robotsthat will precede and later accompany human space travelers.