This web-site contains three programs for calculating various information about our solar system. The Planetary Calculator allows users to compare the mass, size, spin periods, surface gravity and orbital information for each of the nine planets. Users can also create their own formulae to compare different combinations of properties. The Satellite Calculator allows users to compare physical and orbital data for the 63 currently known moons of the planets to see which moon is the largest, has the strongest gravity, and make many other comparisons. The Collision Calculator indicates what happens when a comet or asteroid hits a planet. Users send different-sized objects into different-sized planets to see what the effect would be.
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