After an Epic 4-Billion Mile Chase, We Finally Landed on a Comet

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In this November 10, 2014 handout photo illustration provided by the European Space Agency (ESA) the Rosetta probe (L) and Philae lander are pictured above the 67P/Churyumov-Gerasimenko comet.
( ESA / Getty )
Produced by Angus Chen
PRI WNYC