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  • Friday's
    Astro Fact:
    Did you know that the Planet Uranus's axis is tipped almost 90 degrees, causing extreme seasons where the sun barely ever rises or sets? More...
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    Materials for Students and Instructors.

    Created by Dr. Douglas P. Hamilton and students at U. Maryland. We gratefully acknowledge support from NSF (1998-2003) and NASA (2003-2010). About Us