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Astronomy Picture of the Day

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.

Two spiral galaxies are shown right next to each other, with a smaller distorted galaxy on the far left. Please see the explanation for more detailed information.

The Colliding Spiral Galaxies of Arp 274

Explanation: Two galaxies are squaring off in Virgo and here are the latest pictures. When two galaxies collide , the stars that compose them usually do not. This is because galaxies are mostly empty space and, however bright, stars only take up only a small fraction of that space. But during the collision , one galaxy can rip the other apart gravitationally, and dust and gas common to both galaxies does collide . If the two galaxies merge , black holes that likely resided in each galaxy center may eventually merge . Because the distances are so large, the whole thing takes place in slow motion -- over hundreds of millions of years. Besides the two large spiral galaxies , a smaller third galaxy is visible on the far left of the featured image of Arp 274 , also known as NGC 5679. Arp 274 spans about 200,000 light years across and lies about 400 million light years away toward the constellation of Virgo .

Night Sky Network webinar: APOD editor to review best space images of 2022

Date January 23, 2023
Credit Image Credit: NASA , ESA , Hubble ; Processing & Copyright: Mehmet Hakan Özsaraç
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.