North is to the left.
NGC 520 is a pair of
colliding spiral galaxies about 88 million light-years away in the
constellation Pisces. William Herschel discovered the pair on
December 13, 1784. The two galaxies began to emerge about 300
million years ago. Spectral analysis shows two separate velocity
systems with two nuclei and two small tales.
To the right is the
dwarf galaxy UGC 957, at a distance of 82 million light years. The
above image shows a large faint tidal tail extended northward and
curving boards UGC 957. Some simulations suggest that UGC 957 was a
satellite of one of the original two colliding galaxies that make up
image has at least 3000 visible background galaxies and
nine visible quasars.