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    • Taking the Temperature of a Martian Meteorite
      A chunk of Mars that was hurled to Earth remained cool enough to preserve any microorganisms aboard. So says a group of researchers who have examined martian meteorite ALH84001.
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    • 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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    • 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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    • Seeing Mars through a Test Tube
      By recreating the Martian surface in the laboratory, NASA scientists may have begun to answer two questions: why the Martian surface is so red, and why organic life has not yet been found there.
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    • Jovian Moons
      Jupiter's four largest moons were discovered by Galileo in 1610. Three of them might hold oceans of liquid water beneath their icy exteriors. Liquid water is a prerequisite for life.
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    • The Greening of the Red Planet
      A hardy microbe from Earth may one day transform the barren ground of Mars into arable soil.
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    • Thawing Mars
      Greenhouse gases might one day be used to warm the cold surface of Mars, and make the planet habitable for humans.
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    • Titanic Moon: Orange Soup from Saturnian Turn
      NASA Astrobiology Institute and Penn State have developed a method to understand Titan's atmospheric chemistry.
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    • The Case of the Missing Water
      Did an ancient flood cover the northern lowlands? Mars Orbiter images give a front row seat.
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