Explanation:
The first identified compact galaxy group, Stephan's Quintet is featured in
this remarkable image constructed with data drawn from Hubble Legacy Archive
and the Subaru Telescope on the summit of Mauna Kea. The galaxies of the
quintet are gathered near the center of the field, but really only four of the
five are locked in a cosmic dance of repeated close encounters taking place
some 300 million light-years away. The odd man out is easy to spot, though. The
interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have a more dominant
yellowish cast. They also tend to have distorted loops and tails, grown under
the influence of disruptive gravitational tides. The mostly bluish galaxy, NGC
7320, is in the foreground about 40 million light-years distant, and isn't part
of the interacting group. Still, captured in this field above and to the left
of Stephan's Quintet is another galaxy, NGC 7320C, that is also 300 million
light-years distant. Of course, including it would bring the four interacting
galaxies back up to quintet status. Stephan's Quintet lies within the
boundaries of the high flying constellation Pegasus. At the estimated distance
of the quintet's interacting galaxies, this field of view spans over 500,000
light-years.
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