Video: Mission control celebrates separation but anxiety builds over landing

The European Space Agency reports it has received signals from the Philae lander on the surface of comet 67P/Churyumov–Gerasimenko.

Everything you need to know to get started with observing meteors.

Europe’s Rosetta comet probe re-established momentary contact with the Philae lander late Thursday, renewing hopes of starting up the craft’s research instruments after two weeks of radio silence dampened the moods of scientists.