Science Editor Camille M. Carlisle handles science features for Sky & Telescope. She specializes in black holes, Mars, and whatever she happens to be writing about at the time. Frolic with her through the delights of black holes in her blog, The Black Hole Files.
During its first flyby of Mercury, NASA"s Messenger spacecraft found much less iron on the planet’s surface than expected and a cloud of ionized atoms — including water — caught up in the planet’s magnetosphere. And that’s just for starters.