¿ Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2020 October 18 [2]See Explanation. Clicking on the picture will download the highest resolution version available. UGC 1810: Wildly Interacting Galaxy from Hubble Image Credit: [3]NASA, [4]ESA, [5]Hubble, [6]HLA; Processing & Copyright: [7]Domingo Pestana Explanation: What's happening to this spiral galaxy? Although details remain uncertain, it surely has to do with an ongoing battle with its smaller galactic neighbor. The [8]featured galaxy is labelled UGC 1810 by itself, but together with its [9]collisional partner is known as [10]Arp 273. The overall shape of UGC 1810 -- in particular its [11]blue outer ring -- is likely a result of wild and [12]violent [13]gravitational [14]interactions. This ring's blue color is caused by massive stars that are [15]blue hot and have formed only in the past few million years. The [16]inner galaxy appears older, redder, and threaded with cool [17]filamentary dust. A few bright [18]stars appear well in the foreground, unrelated to [19]UGC 1810, while several galaxies are visible well in the background. [20]Arp 273 lies about 300 million light years away [21]toward the constellation of Andromeda. Quite likely, UGC 1810 will [22]devour its [23]galactic sidekick over the next billion years and settle into a classic [24]spiral form. 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