So today's the day.
© AP Photo/ESA Picture taken with navigation camera on Rosetta shows a raised plateau on the larger lobe of Comet 67P/Churyumov–Gerasimenko.
DARMSTADT, Germany (AP) — The European Space Agency's unmanned Rosetta probe successfully released a lander toward the surface of comet 67P/Churyumov-Gerasimenko on Wednesday, putting it on its final seven-hour journey to a historic rendezvous with the fast-moving lump of dust and ice.
The audacious landing attempt is the climax of a decade-long mission to study the 4-kilometer (2.5-mile) wide comet. It is also the end of a 6.4 billion-kilometer (4 billion-mile) journey on which Rosetta carried its sidekick lander Philae piggyback.
"It's on its own now," said Stephan Ulamec, Philae Lander Manager at the DLR German Aerospace Center. "We'll need some luck not to land on a boulder or a steep slope."