Rosetta: The comet chaser

The Rosetta spacecraft was launched in 2004 and arrived at Comet 67P/Churyumov-Gerasimenko on August 6, 2014, becoming the first probe to rendezvous with a comet. A few months later, on November 12, Rosetta dropped its Philae lander to the comet's surface -- another first. But the lander didn't latch onto the comet properly, bounced around and was "lost" on the comet. After about 60 hours of operations, the lander went into hibernation. On June 13, 2015 mission managers at the European Space Agency said they had reestablished contact with the small probe.