Science 282, 1779. December 4, 1998.
Netwatch
Playing God with the Solar System
Excerpt:
"Find out at
the Astronomy Workshop how big a crater you'd create if you hurled a
kilometer-wide chunk of ice at the moon or Mars. Other programs let
you tinker with planet orbitals, see how gravity affects an asteroid's
orbit, and more. janus.astro.umd.edu"
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