Etymology

dark flow

Today it means: A possible non-random component of the peculiar velocity of galaxy clusters. Full definition →

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dark flow · noun1

From dark (“hidden”) + flow. From the motion of galaxy clusters due to a hidden influence, possibly from beyond the horizon of the observable universe.

dark flow · noun2

From dark (“sinister”) + flow (“state of focus”).

Etymology from Wiktionary, CC BY-SA 4.0.