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ExtremeTech Access

Astronomers Successfully Measure the Motion of 66 Nearby Galaxies

by Ryan Whitwam

The heavens appear to move throughout the year, but that’s just because Earth is moving. The real or “proper motion” of stars and galaxies was beyond our ability to measure until fairly recently, but bigger, more powerful telescopes have helped paint a picture of an evolving universe. The European Space Agency’s Gaia space telescope has…

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