The European Space Agency's Philae lander completed its last transmission Friday (Nov. 14) at 7:36 p.m. EST (0036 GMT) before settling into a hibernation state as its batteries ran out.
The probe had been studying the surface of Comet 67P/Churyumov–Gerasimenko for 57 hours when it went to sleep, possibly for good.
Philae landed on the comet on Wednesday (Nov. 12) as part of ESA's historic Rosetta mission.
"It has been a huge success, the whole team is delighted," Philae lander manager Stephan Ulamec of DLR German Aerospace Agency, who tracked the comet landing from ESA's Space Operations Center in Darmstadt, Germany, said in an ESA statement.
"Despite the unplanned series of three touchdowns, all of our instruments could be operated and now it's time to see what we've got."