A massive galaxy cluster full of galaxies of all shapes and sizes, which seem to be surrounded by a bright blue haze.

El Gordo (ACT-CL J0102-4915)

This is a Hubble image of the most massive cluster of galaxies ever seen to exist when the universe was just half its current age of 13.8 billion years. The cluster contains several hundred galaxies.

Credits: NASA, ESA, and J. Jee (University of California, Davis)
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Image CreditNASA, ESA, and J. Jee (University of California, Davis)
Size640x384px