Tuesday, January 27, 2009

A True Double Planet System.

What-if speculation is at the heart of science fiction. For instance, look at this 1613 map of the moon drawn by English astronomer, Thomas Harriot. (Credit Lord Egremont and the Royal Astronomical Society here.) The Moon looks like it has Earth-like features. What if it did? What if our closest neighbor in space were a planet similar to ours, with breathable atmosphere, an ocean, a continent and islands? What difference would that have made to our history?

-tdr

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