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Luminous Discs

Three pale blue galaxies, two of which are interacting.
Three pale blue galaxies, two of which are interacting. Image: NASA/STScI/CEERS/TACC/S. Finkelstein/M. Bagley/Z. Levay

In this image, we see two spiral galaxies interacting at z=0.7. A third galaxy, at left, is a similar opalescent white. The large white arrow points to a supernova discovered on the outskirts of the smaller galaxy.