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Black Holes Encyclopedia

Alternate Names

IC 4625




in the constellation Ophiuchus


320 million light-years (98 megaparsecs)


870 million to 2 billion times the mass of the Sun


Diameter roughly equal to the diameter of Uranus' or Neptune's orbit around the Sun

Discovery Methods


NGC 6240

NGC 6240

This image from Chandra X-Ray Observatory shows the two black-hole nuclei as white and blue blobs near the center.

NGC 6240

A Hubble Space Telescope view of NGC 6240.

NGC 6240

A combined optical and X-ray view of the twin nuclei of NGC 6240.

NGC 6240

NGC 6240 in a combination of visible light (blue and white) and X-rays (red, orange, and yellow) from two space telescopes.

NGC 6240

A combined X-ray and optical view of NGC 6240. The purple is produced by X-rays from gas that's been heated by radiation from vigorous young stars in the merging galaxies.

A Tour of NGC 6240

This document was last modified: May 1, 2013.