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NASA Astronomy Picture of the Day 23 January 2023: Hubble snaps collision of galaxies

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NASA Astronomy Picture of the Day 23 January 2023: Galaxies are large collections of stars, gas, dust, and dark matter held together by gravity.

They come in a variety of sizes, from small dwarf galaxies with only a few billion stars to giant elliptical galaxies with trillions of stars.

Although most galaxies have elliptical shapes, a few have unusual shapes like toothpicks or rings. Most galaxies exist in groups or clusters with dozens or hundreds of members, and these cluster galaxies are all in constant motion, pulled and twisted by their neighbour's gravity, according to NASA.NASA's Astronomy Picture of the Day is a snapshot of a stunning pair of colliding spiral galaxies located in the constellation of Virgo, known as Arp 274.

Arp 274 is located nearly 400 million light-years away and spans almost 200,000 light-years. The galaxies have been slowly gravitationally pulling towards each other for millions of years.

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