The moment has come for humans to land a probe on a comet as the European Space Agency’s Rosetta spacecraft is scheduled to deploy a Philae lander on a comet for the first time in history.

After ten years spent in space, the Rosetta spacecraft has caught up with Comet 67P/Churyumov-Gerasimeno. It will take seven hours to get Philae on the comet. Watch the events unfold from the European Space Operations Center Mission Control Room live. The action begins from around 5 p.m. Greek local time:

Once it lands, the lander will have about 2.5 days of battery life for its research.

Here are some of the complicated orbital movements:

Jagged peaks and troughs are hard enough to land on, but Comet 67P/Churyumov-Gerasimenko also has an added challenge – its landing point is constantly changing as it rotates about its axis every 12 hours.