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    July 12, 2013

    Life on Mars:

    Ultra-High-Energy Cosmic Rays:

    Type 1a Supernovae:

    Dark Matter:

    The Fate of the Universe:

    SUBSCRIBE, future astronauts:
    LINKS for the TOP 5 are listed BELOW!!

    Watch more of The Countdown:
    Visit Scientific American’s website for more space news:

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