Deep-Sky Dreams: Keenan’s System 

The sky is filled with interacting galaxies — galaxies that are gravitationally intertwined and physically involved with each other, many of them merging into larger, distorted galaxies over time. This is a little counterintuitive, because at large scales the entire universe is expanding. But on smaller scales, gravity wins the game and brings matter together, especiallyContinue reading “Deep-Sky Dreams: Keenan’s System ”
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