Smallest Black Hole?
An artist's concept shows superhot gas spiraling around XTE J1650-500, which astronomers say is the smallest black hole yet discovered. The gas comes from a bloated companion star, which is shown in the background. The black hole may be about 3.8 times as massive as the Sun, which is about half as much as a typical "stellar-mass" black hole. [NASA/CXC/A. Hobar]