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At the center of a galaxy some 4 billion light years from Earth, something extraordinary is happening. This galaxy, known as CID-42, contains a giant black hole. This fact itself is not so unusual. What is different about CID-42 is that this supermassive black hole is being ejected from its host galaxy at several million miles per hour. What led to this black hole ejection? Astronomers think that in the past CID-42 collided with another galaxy. When it did, the two central black holes also collided and merged. The joined black hole then received a powerful kick from gravitational waves, a phenomenon predicted by Einstein but never directly detected. While astronomers have been studying CID-42 for quite some time, it took new data from Chandra's High Resolution Camera to pinpoint just where the X-rays were coming from, which helped clarify just what was going on in this galaxy.