Rosetta's Philae Probe Lands On Comet

Yesterday, the European Space Agency's Rosetta mission has soft-landed its Philae probe on a comet, the first time in history that such an extraordinary feat has been achieved.
After a tense wait during the seven-hour descent to the surface of Comet 67P/Churyumov–Gerasimenko, the signal confirming the successful touchdown arrived on Earth.

Update: Rosetta probe has bounced away from landing site and lost contact.