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    15 Facts About Our Planet For Earth Day

    How much do you know about the planet you live on? Here are 15 scientific facts about our home world to help you celebrate Earth Day in as geeky a way possible.

    Phil Plait
    by Phil Plait

    Community Contributor

    Earth Day is all about, well Earth. But how much do you know about this planet? Find out at Bad Astronomy.

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