About 18 months ago, we discussed a mysterious “dark flow” that was seen in early releases of the data from the Wilkinson Microwave Anisotropy Probe data. At that time, we remarked that it was little ...

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WASHINGTON — Using data from NASA’s Wilkinson Microwave Anisotropy Probe (WMAP), scientists have identified an unexpected motion in distant galaxy clusters. The cause, they suggest, is the ...

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The puzzling migration of matter in deep space — dubbed "dark flow" — has been observed at farther distances than ever before, scientists have announced. Subscribe to read this story ad-free Get ...

A: When photons scatter off electrons moving toward us, the photons gain energy; when photons scatter off electrons moving away from us, they lose energy. This effect is called the kinematic ...

As if the mysteries of dark matter and dark energy weren't vexing enough, another baffling cosmic puzzle has been discovered. Subscribe to read this story ad-free Get unlimited access to ad-free ...

Astronomers have found that whole clusters of galaxies are moving in convoy towards a single point in the sky. This unexpected motion appears to be separate from the expansion of the universe and the ...