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The source of this material is Windows to the Universe, at http://windows2universe.org from the National Earth Science Teachers Association (NESTA). The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010. © 2010 National Earth Science Teachers Association. Windows to the UniverseŽ is a registered trademark of NESTA. All Rights Reserved. See our copyright and licenses page for information about how you can use our materials. Site policies and disclaimer.
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Site last updated on 9/20/10