English: NGC 6240 is a peculiar, butterfly- or lobster-shaped galaxy consisting of two smaller merging galaxies. It lies in the constellation of Ophiuchus, the Serpent Holder, some 400 million light-years away. Observations with NASA s Chandra X-ray Observatory have disclosed two giant black holes, about 3,000 light-years apart, which will drift toward one another and eventually merge together into a larger black hole. The merging process, which began about 30 million years ago, triggered dramatic star formation and sparked numerous supernova explosions. The merger will be complete in some tens to hundreds of millions of years.

This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on the occasion of its 18th anniversary on 24th April 2008.

About the object
Object name	NGC 6240, VV 617
Object description	Interacting Galaxies
Position (J2000)	16 52 59.10 +02 24 02.6
Constellation	Ophiuchus
Distance	350 million light-years (100 million parsecs)
About the data
Data description	The Hubble image was created using HST data from proposal 10592: A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)
Instrument	ACS/WFC
Exposure date(s)	February 10, 2002
Exposure time	33 minutes
Filters	F435W (B) and F814W (I)