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Two ancient galaxies, merging

About 13 billion years ago there was a titanic collision.

Composite image of B14-65666 showing the distributions of dust (red), oxygen (green) and carbon (blue), observed by ALMA, and stars (white), observed by the Hubble Space Telescope. Credit: ALMA (ESO/NAOJ/NRAO), NASA/ESA Hubble Space Telescope, Hashimoto et al.