Communication with the lander is slow, with signals taking more than 28 minutes to travel between Earth and Philae's mother ship, the Rosetta orbiter flying above the comet.
Even if Philae uses up all its energy, it will remain on the comet in a mode of hibernation for the coming months. The comet is on a 6 ½-year elliptical orbit around the sun, and at the moment it is getting closer. So, in theory, Philae could wake up again if the comet passes the sun in such a way that the solar panels catch more light. - cbc.ca
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