from nbcnews.com: After a suspense-packed, seven-hour descent, the European Space Agency’s Philae lander made an unprecedented touchdown on the surface of a comet Wednesday — marking the high point of a $1.3 billion, 10-year mission. Cheers erupted as the confirming signals were received at the European Space Operations Center in Darmstadt, Germany, at 11:03 a.m.…

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