What did Galileo actually do?

(PhysOrg.com) -- What convinced Galileo 400 years ago that the Earth orbits the Sun and not vice-versa? How did one man make such a startling discovery, armed with just a 2 inch lens telescope?

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<p><a href="http://www.physorg.com/news154281801.html">What did Galileo actually do?</a></p> <p>(PhysOrg.com) -- What convinced Galileo 400 years ago that the Earth orbits the Sun and not vice-versa? How did one man make such a startling discovery, armed with just a 2 inch lens telescope? </p>