Billions of galaxies dot our observable universe, and this image captures a less-commonly seen example, Arp 227.
Warren Keller and Steve Mazlin took this image from Star Shadows Remote Observatory PROMPT2 CTIO near La Serena, Chile.
"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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