How’s that for a beacon? NASA’s Chandra X-ray Observatory has tracked down evidence of at least a couple of past luminous outbursts near the Milky Way’s huge black hole. These flare-ups took place sometime in the past few hundred years, which is very recently in astronomical terms. “The echoes from Sagittarius A were likely produced … Continue reading "‘Light Echos’ Reveal Old, Bright Outbursts Near Milky Way’s Black Hole"