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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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    Sunday's
    Astro Fact:
    Did you know that Titan, the planet-sized moon of Saturn, has an environment in many ways similar to that of the early Earth? More...
    visits to the Astronomy Workshop since January 1st, 2000. 

    Materials for Students and Instructors.

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