The shadowy area around the supermassive black hole in our galaxy's center lit up last year as it shredded a cloud of gas and dust called G2, which ventured too close. Black holes are virtually invisible unless they're actively destroying something. Our black hole's violent meeting with G2 began last July, and it gave astronomers a chance to peer inside the galactic center - the neighborhood around the black hole - rather than just simulate the swirling disc of gas and dust surrounding it. "What a difference it is when you can watch!" says G2's co-discoverer Stefan Gillessen, a scientist at the Max Planck Institute for Extraterrestrial Physics in Germany.
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