GRO J1655-40
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GRO J1655-40 is an aging star and a heavy, unseen companion which orbit each other once every 2.6 days in the constellation of Scorpius. The dark companion is "stealing" gas from the surface of the visible star. Astronomers calculate that the dark companion is almost certainly a black hole that's several times the mass of our star, the Sun.
GRO J1655-40 and its companion are moving through our galaxy at around 250,000 miles per hour (112 km.s-1). This supports the idea that the black hole formed from the collapse of the core of a massive star. As the core collapsed, its outer layers exploded as a supernova. The explosion was a little off-center, so it sent the system racing through the galaxy.
