Friday, August 15, 2014

Tonight's Sky for August 15: First Extrasolar Solar System

On this date in 2001, scientists announced the discovery of a planet orbiting the star 47 Ursa Major. While not unique in itself (the first extrasolar planet was found in 1995), this was unique in that, with this discovery, 47 Ursa Major became the first star other than the Sun known to have multiple planets. In the intervening years, over 450 multi-planet extrasolar solar systems have been discovered. 

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