Rosetta Sees Its Shadow on a Comet

I suppose, if you want to be traditional about it, Valentine's Day is a good time to get as close as you can to the one you love. That may be why the Rosetta space probe dipped to a mere 6 kilometers from the surface of the comet 67P/Churyumov-Gerasimenko on Feb. 14, 2015. When it did, it saw something remarkable: Its own shadow on the surface of the comet! I guess that means six more weeks of winter for 67/P. Of course, when your temperature is -70 C, it's always winter. A few weeks ago, Rosett...