The living Cosmos

It looks like biology, but it is cosmology. It looks like some sort of fungus or lichen, but it is a simulation of the era of reionization around 13 billion years ago, when the Universe was still only a few hundred million years old. The very first stars and galaxies heated up the dense hydrogen that was everywhere, creating small, hot bubbles that would grow  together and leave little islands of neutral hydrogen, which would eventually become galaxies like our own Milky Way.

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