This is beautiful:

It’s the galaxy cluster Abell 2744, and it appears to be the collision of four separate clusters of galaxies. Clusters are the largest gravitationally-bound structures in the universe. That means that galaxies are bound by gravity into groups, and groups into clusters, but clusters aren’t bound do anything bigger than themselves. Our minds boggle at the size of our own stellar neighborhood, much less our galaxy, and beyond that it’s just zeroes. “Such knowledge is too wonderful for me,” said the Psalmist. “The night is as bright as the day, for darkness is as light to you.”

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