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  • Do We Know What Killed the Dinosaurs?
    What killed the dinosaurs? Many geologists and paleontologists now think that a large asteroid or comet impacting the Earth must have caused a global catastrophe that led to this extensive loss of life.
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  • Mars Odyssey Finds Large Water Concentrations
    Early results from the Mars Odyssey orbiter show the signature of large water concentrations.
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  • Did Hades Freeze Over?
    Initially, the surface of our planet was a fiery, molten stew. Within a few million years, the crust cooled and water vapor rained down to form the oceans, where life may have made it's first appearance.
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  • Galactic Habitable Zones
    Our Milky Way Galaxy is unusual in that it is one of the most massive galaxies in the nearby universe. Our Solar System also seems to have qualities that make it rather unique. These qualities make the Sun one of the few stars in
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  • Galactic Habitable Zones
    Our Milky Way Galaxy is unusual in that it is one of the most massive galaxies in the nearby universe. Our Solar System also seems to have qualities that make it rather unique. These qualities make the Sun one of the few stars in the
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  • The Birth and Death of Embryonic Planets
    Researchers study how planets form around stars in the Orion Nebula, hoping to understand better how planets in our own solar system formed.
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  • Life’s Baby Steps
    Billions of years ago, amino acids somehow linked together to form chainlike molecules. Now scientists have discovered what may be a key step in this process - a step that has baffled researchers for more than a half a century.
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  • How Jupiter Got Big
    How did the largest planet in our solar system form? New theories on how planets like Jupiter form put traditional theories to the test.
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  • Unpuzzling Proteins
    Thanks to a new supercomputer, scientists may be a step closer to understanding one of nature's more difficult puzzles.
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  • Reflections From a Warm Little Pond
    Scientists theorize possible scenarios on how life could have first originated on Earth.
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  • Roses for the Red Planet
    Scientists discuss the importance and the possible risks of seeding the Red Planet.
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  • Focus on Europa
    Scientists from a variety of disciplines met recently to consider the possibility of life on Europa, and to plan how to look for it.
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  • Life’s Chemical Fingerprints
    Using a technique called Raman spectroscopy, researchers are developing instruments that may one day search for life on Mars, Europa, or Callisto.
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  • Return to the Red Planet
    On Saturday, April 7, NASA's next mission to Mars is set to launch. The 2001 Mars Odyssey will investigate the history of water on the Red Planet.
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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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