Billions of galaxies dot our observable universe, and this image captures a less-commonly seen example, Arp 227.
"As we're fortunate enough to image from a premium location in the southern hemisphere, we often gravitate to the beautiful island universes of the south," Keller wrote in an email to Space.com. [65 Amazing Galaxy Photos to Enjoy]
Arp 227 consists of the two galaxies, the shell galaxy NGC 474 and its blue, spiral neighbor NGC 470. The shells are faint arcs that could have been formed by a gravitational encounter or a merger with a nearby galaxy causing an effect that resembles ripples on a pond. It’s approximately 100 million light-years away within the constellation Pisces. A light-year is the distance light travels in one year, or about 6 trillion miles (10 trillion kilometers).
The duo used a FLI PL16803 camera on a PlaneWave Ascension 200HR mount for approximately 45 hours total exposure LRGB at 1,800 seconds each.
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