... Behemoth black hole found in an unlikely place . ... black holes . ... X-ray echo lights up galactic center . NASA's Chandra X-ray Observatory sees the X-ray echo from a past flare-up of the Milky Way's black hole. ... An X-ray echo points to a powerful flare from the Milky Wayт??s black hole (known as Sgr A*) some 50 years ago. ... Muno suggests outflows from stars near the galactic center may accumulate in a disk that, every century or so, becomes unstable and dumps material into the black hole. ...