Two moons, two planets, one asteroid and now a comet! 1

JISHOU, HUNAN — The European Space Agency’s successful landing of a probe on the surface of a comet Thursday is yet another milestone in our exploration of the solar system. It’s the latest in a series of missions that bring the exotic down to Earth. It’s also the most impressive, considering the Rosetta probe had to loop around the inner solar system for 10 years to catch up to Comet 67P/Churyumov–Gerasimenko and the Philae lander had to guide itself to land on an object only 4 km across at its widest point. Comet 67P is more than 500 million kilometers from Earth, so it’s very unlikely any of us will have a chance to stand (carefully) on its surface. But Philae is our stand-in, and in just a day’s time sent back some impressive images. Now, you might be thinking, “So what? It’s not especially interesting. Some rocks and stuff.” But consider that this is a place 500 million km away that no one has ever seen before, a place that has been undisturbed for at least 4.5 billion years, and we get to see it! Planetary scientists are naturally also interested in the composition and structure of the comet, ...
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