NGC 3921
NGC 3921 — found in the constellation of Ursa Major (The Great Bear) — is an interacting pair of disk galaxies in the late stages of its merger. Observations show that both of the galaxies involved were about the same mass and collided about 700 million years ago.
Image Credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt
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https://science.nasa.gov/image-detail/evolution-in-slow-motion/
Image CreditESA/Hubble & NASA, Acknowledgement: Judy Schmidt
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