... that lasted at least 200 million years may be responsible for the halo in NGC6240 ... giant gas cloud, which scientists call a halo, is located in the system NGC6240 ...
... In the center of NGC6240, the two black holes in the cores will whip up a frenzy of ... are in a single, tangled galaxy called NGC6240, located 400-million light-years ...
... In 2002, Chandra identified the first known "binary black hole" a pair of supermassive black holes living side by side in the unusually bright galaxy NGC6240. ...
... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ...