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Featured Tool:
Astronomers have found huge planets orbiting very close to their parent stars. Could they have moons? Find out with the Extrasolar Planetary Satellite Integrator!



Saturn Ratings

  • Astronomy Classroom
  • Explore the Possibilities
  • Solar System Calculators
  • Solar System Viewers
  • Working With Orbits
  • Orbital Integrators
  • Extragalactic
  • Index of all Tools


  • Sunday's
    Astro Fact:
    Did you know that there are pieces of Mars sitting on the Antarctic ice sheets? 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