Available - The toolkit contains everything you need to celebrate the 2018 theme "Earth as Inspiration."
photoclinometry (pho''-to-cli-nom'-e-try). A technique for ascertaining slope information from a distribution of image brightness; it is used esp. for studying the amount of slope of a lunar crater wall or ridge by measuring the... more
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Enter contests, target special days, see city celebrations, learn outdoors, explore careers and social networking
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Obtain a Toolkit, review classroom activities, explore the Center
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