But some problems with the lander leave them scratching their heads about what actually happened.
Luckily, the lander seems to be safe and collecting data — at least for now. We are currently out of touch with the probe, since its relay station and home is beyond the horizon.
When the probe, Philae, first landed, the ESA scientists were thrilled...
The touchdown was confirmed. "We are on the comet," said Stephan Ulamec, the Philae lander manager, on the ESA live broadcast shortly after getting data and images back from the little probe.
It appeared Philae had successfully retracted its landing gear and was "sitting on the surface."
"Philae is on the comet," he said with a grin. But there's a problem.