Feature Stories

  • Can Liquid Water Exist on Present-day Mars?
    Scientific consensus holds that liquid water cannot exist on the surface of Mars. But now a pair of scientists argue that liquid water in limited amounts and for limited times may indeed be present on Mars' surface.
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  • Evo Devo Learns a Larval Lesson
    Scientists have studied the life history of animals, part of a field called development, for many decades. Other scientists have studied how life arose and evolved on Earth.
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  • Through Thick or Thin: Exploring Europa's Outer Layer of Ice
    When NASA's Galileo spacecraft sent back images and data of the Jovian moon Europa, scientists began thinking seriously that life just might exist on this enigmatic, frozen world.
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  • Through Thick or Thin: Exploring Europa’s Outer Layer of Ice
    When NASA's Galileo spacecraft sent back images and data of the Jovian moon Europa, scientists began thinking seriously that life just might exist on this enigmatic, frozen world.
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  • TNA World
    DNA is the building block for life on Earth. But it is a highly complex molecule, and could not have arranged itself spontaneously. What did it develop from? Astrobiologists examine possible ancestors of DNA: nucleic acids called PNA, p-RNA, and TNA.
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  • Some Like it Hot
    NASA astrobiologist Jack Farmer studies microorganisms.
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  • A Shortage of Planets
    When they turned the Hubble Space Telescope on a distant globular cluster of stars, astronomers expected to find fifteen or twenty planets. They found zero.
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  • Two Rovers in Search of a Landing Site
    In the spring of 2003, NASA will send two rovers to Mars to search for signs of water in the planet's ancient past. But where exactly on Mars should they look for it?
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  • A Visit to Cupid for Valentine’s Day
    On February 12, NEAR Shoemaker becomes the first spacecraft to land on an asteroid. Its findings may tell us something about our planet, our solar system, and solar systems beyond our own.
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  • A Visit to Cupid for Valentine's Day
    On February 12, NEAR Shoemaker becomes the first spacecraft to land on an asteroid. Its findings may tell us something about our planet, our solar system, and solar systems beyond our own.
    more...