Drama abounded when Europe's Philae probe landed on a comet last November?"especially when the lander bounced a half mile into the air before its final touchdown, then quickly lost power. But Philae's mother ship, the European Space Agency's Rosetta probe, has not only kept orbiting comet 67P/Churyumov-Gerasimenko since August, but also has begun to do some extraordinary science, as seven just-published studies in Science make clear. No spacecraft has ever ridden along with a comet on its closest approach the sun, moreover, so the researchers will be learning about that process in detail for the first time during the rest of 2015.