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Explanation: What's happening to these spiral galaxies? Although details remain uncertain, there sure seems to be a titanic battle going on. The upper galaxy is labelled UGC 1810 by itself, but together with its collisional partners is known as Arp 273. The overall shape of the UGC 1810 -- in particular its blue outer ring -- is likely a result of wild and violent gravitational interactions. The blue color of the outer ring at the top is caused by massive stars that are blue hot and have formed only in the past few million years. The inner part of the upper galaxy -- itself an older spiral galaxy -- appears redder and threaded with cool filamentary dust. A few bright stars appear well in the foreground, unrelated to colliding galaxies, while several far-distant galaxies are visible in the background. Arp 273 lies about 300 million light years away toward the constellation of Andromeda. Quite likely, UGC 1810 will devour its galactic sidekicks over the next billion years and settle into a classic spiral form.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: interacting galaxies
Publications with words: interacting galaxies
See also:
- APOD: 2025 March 12 Á NGC 772: The Fiddlehead Galaxy
- Peculiar Galaxies of Arp 273
- APOD: 2025 January 6 Á Colliding Spiral Galaxies from Webb and Hubble
- Shell Galaxies in Pisces
- APOD: 2024 July 15 Á The Tadpole Galaxy from Hubble
- Unraveling NGC 3169
- APOD: 2023 October 24 Á Arp 87: Merging Galaxies from Hubble