What does the supermassive black hole lurking at the center of our galaxy look like?It's a deceptively simple question. Although our local cosmic abyss, named Sgr A* (short for Sagittarius A* ...

WASHINGTON, Nov 5 (Reuters) - At the heart of our Milky Way galaxy lurks a supermassive black hole about four million times the mass of the sun, called Sagittarius A*. In fact, these objects ...