Today, after 10 years of space travel, the Rosetta explorer became the first to orbit a comet. The best is yet to come - the scientists behind the satellite are preparing to land a harpoon-like probe on the surface this November. Yet new information is already pouring in. What scientists have discovered is already starting to transform our understanding of Rosetta's target comet, 67P/Churyumov-Gerasimenko (C-G for short), and cometary science ( via popularmechanics.com ).
Here are three surprising facts we've already learned: