From the NASA press release:
Earlier this morning, the European Space Agency’s Rosetta Mission deployed its comet lander, “Philae.” Seven hours later at 11 a.m. EST, the experiment-laden, harpoon-firing Philae is set to touch down on the surface of comet 67P/Churyumov-Gerasimenko.
It will be the first time in history that a spacecraft has attempted a soft landing on a comet. Rosetta is an international mission led by ESA – European Space Agency, with instruments provided by its member states, and additional support and instruments provided by NASA.
NASA Television will provide live coverage from 9-11:30 a.m. EST of Rosetta scheduled landing of a probe on a comet today. NASA’s live commentary will include excerpts of the ESA coverage and air from 9-10 a.m. EST. NASA will continue carrying ESA’s commentary from 10-11:30 a.m. EST. ESA’s Philae (fee-LAY) lander is scheduled to touch down on comet 67P/Churyumov-Gerasimenko at 10:35 a.m. EST. A signal confirming landing is expected at approximately 11:02 a.m. EST.
After landing, Philae will obtain the first images ever taken from a comet’s surface. It also will drill into the surface to study the composition and witness close up how a comet changes as its exposure to the sun varies. Philae can remain active on the surface for approximately two-and-a-half days. Its “mothership” is the Rosetta spacecraft that will remain in orbit around the comet through 2015. The orbiter will continue detailed studies of the comet as it approaches the sun and then moves away. NASA has three of the 16 instruments aboard the orbiter.
Comets are considered primitive building blocks of the solar system that are literally frozen in time. They may have played a part in “seeding” Earth with water and, possibly, the basic ingredients for life.
Watch NASA TV online at: http://www.nasa.gov/nasatv