The tricky landing of a 100-kg probe on the comet’s surface Nov. 12 marks the crowning achievement in an already stunning exploration campaign.

An illustrated guide to Philae's deployment and landing on Comet 67P/Churyumov-Gerasimenko, with the proble's thrusters, landing gear, harpoons and science instruments demystified.

Already a historic achievement, Europe's Rosetta mission marks first-ever touchdown on 67P/Churyumov–Gerasimenko

Rosetta's orbiter and lander have sent back first images of the 100-kg probe's descent.

During checks on the lander’s health overnight, mission managers found its active descent system, which uses a cold-gas thrust to avoid spacecraft rebound at the moment of touchdown, cannot be activated.

After more than a decade spent cruising through deep space to rendezvous with Comet 67P/Churyumov–Gerasimenko, ESA's Rosetta mission is preparing to deploy a small lander to its surface early Wednesday, a process that mission managers liken to moving an object from one speeding bullet to another.

One of China’s strengths in the space game was thought to be cost, but SpaceX appears to be undercutting the country’s edge in this regard.

"It's an honor for me to work with these guys." said ISS commander Maxim Suraev, as Expedition 41 drew to a close late Sunday.