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For decades it was assumed that nine planets comprised the solar system. Pluto was the runt of the litter, drifting 40 times further from the sun than Earth, and just 1/500th of the size. Then in 1992...
Follows astronomers from Manchester, Switzerland and California as they scour the skies for signs of planetary systems other than our own. Recently other solar systems have been discovered with what appear...
Dr. Dale Cruikshank from NASA reviews what we know about Pluto (including its atmosphere, of which he was the co-discoverer), why Pluto was re-classified as a dwarf planet in the fall of 2006, and what the...
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