In astrophysics, dark flow is a theoretical non-random component of the peculiar velocity of galaxy clusters. The actual measured velocity is the sum of the velocity predicted by Hubble's Law plus a possible small and unexplained velocity flowing in a common direction. Dark flow represents the movement of hundreds of galaxy clusters at about two million miles per hour in the direction of a patch of sky between the constellations Centaurus and Vela. Like the cloaked duo of dark matter and dark energy, dark flow is another masked marauder challenging long-held cosmological assumptions. In 2008, Alexander Kashlinsky and his collaborators claimed the detection of a “dark flow” after analyzing this kSZ effect in the cosmic microwave background (CMB), the residual radiation throughout the universe due to the Big Bang. Additional images from Goddard SVS Distant galaxy clusters mysteriously stream at a million miles per hour along a path roughly centered on the southern constellations Centaurus and Hydra.

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