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How far from Earth can the Moon be before the Sun's gravity pulls it away into heliocentric orbit? Find out using the Satellite Integrator!

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  • Wednesday's
    Astro Fact:
    Did you know that Venus appears to have experienced a catastrophic resurfacing episode only 500 million years ago? More...
    The Astronomy Workshop has averaged about 20,000 page views per year and has now outlived its counter!  

    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