To Catch a Comet
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On November 11, 2014, a spacecraft orbiter and lander set out to do what no other had dared to attempt: land on the volatile surface of a comet. (Also Fri. 7/17 at 4 a.m. and 11 p.m.; Sun. 7/19 at 1 p.m.)
Aired: 07/15/15
Expired: 07/15/15
