UGC 1810- wildly Interacting Galaxy

The featured spiral galaxy is labelled UGC 1810 by itself, but together with its collisional partner is known as Arp 273.

 Arp 273 lies about 300 million light years away toward the constellation of Andromeda.

Although details remain uncertain, it surely has to do with an ongoing battle with its smaller galactic neighbor. The overall shape of UGC 1810 — in particular its blue outer ring — is likely a result of wild and violent gravitational interactions. This ring’s blue color is caused by massive stars that are blue hot and have formed only in the past few million years.

Above: Image taken by the NASA/ESA Hubble Space Telescope shows Arp 273, a pair of interacting galaxies.

The inner galaxy appears older, redder, and threaded with cool filamentary dust. A few bright stars appear well in the foreground, unrelated to UGC 1810, while several galaxies are visible well in the background.

Quite likely, UGC 1810 will devour its galactic sidekick over the next billion years and settle into a classic spiral form.

Top image credit NASA, ESA, Hubble, HLA; Processing & Copyright: Domingo Pestana

source APOD