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Arp 273 (Interacting Galaxy)


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Arp 273 (UGC 1810)
Interacting Galaxy (相互作用銀河)


別名 (Other names)
UGC 1810

距離 (Distance)
3億光年 (300 million light-years)

星座 (Constellation)
アンドロメダ座 (And) (Andromeda)

Arp 273 (UGC 1810) is an interacting galaxy located 300 million light years from the Earth in the constellation Andromeda.

Arp 273 (Interacting Galaxy) : Picture

Peculiar Galaxies of Arp 273
Peculiar Galaxies of Arp 273
(C) NASA, ESA, and the Hubble Heritage Team (STScI / AURA)
The spiky stars in the foreground of this sharp cosmic portrait are well within our own Milky Way Galaxy. The two eye-catching galaxies lie far beyond the Milky Way, at a distance of over 300 million light-years. Their distorted appearance is due to gravitational tides as the pair engage in close encounters. Cataloged as Arp 273 (also as UGC 1810), the galaxies do look peculiar, but interacting galaxies are now understood to be common in the universe. In fact, the nearby large spiral Andromeda Galaxy is known to be some 2 million light-years away and approaching the Milky Way. Arp 273 may offer an analog of their far future encounter. Repeated galaxy encounters on a cosmic timescale can ultimately result in a merger into a single galaxy of stars. From our perspective, the bright cores of the Arp 273 galaxies are separated by only a little over 100,000 light-years. The release of this stunning vista celebrates the 21st anniversary of the Hubble Space Telescope in orbit.

Arp 273
Arp 273
(C) Adam Block, Mount Lemmon SkyCenter, University of Arizona, NASA

Arp 273 Arp 273
Arp 273
(C) NASA
Arp 273
(C) NASA
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Arp 273 (Interacting Galaxy) : Movie

Rendezvous with Interacting Galaxies Arp 273
This image of rose-shaped galaxy pair Arp 273 was released in celebration of Hubble's 21st anniversary. Curious what it might look like to a passing space traveler? This video takes you in close to the large spiral and its smaller companion galaxy.

Arp 273 lies in the constellation Andromeda and is roughly 300 million light-years away from Earth. It's made up of a large spiral galaxy, known as UGC 1810, with a disk that is distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813. A swath of blue, jewel-like points across the top is the combined light from clusters of intensely bright and hot young blue stars.

The smaller, nearly edge-on companion galaxy shows distinct signs of intense star formation at its nucleus, perhaps triggered by the encounter with the larger galaxy.
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