TRY TO THINK OF SOMETHING NOT FOR WHAT IT ONCE WAS, BUT FOR WHAT IT CAN BE.

if you don't step forward, you're always in the same place.

Monday, July 18, 2011

HALLEY'S COMET.



Of the thousands of known comets in the solar system, Halley's comet is one of some 200 that are periodic. Halley's comet orbits Earth every 76 years; the next flyby will occur in 2061.

visit:
science.nationalgeographic.com

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