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Astronomers find runaway galaxies

25 April 2015 Astronomy Now

Researchers mining data from Virtual Observatory archives found 11 previously unknown compact elliptical galaxies that were isolated from from any galaxy cluster, flung out of their homes at speeds up to 6 million miles per hour to wander the void of intergalactic space.

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Cosmic tsunami wakes up comatose galaxies

24 April 2015 Astronomy Now

An international team of astronomers have discovered sleeping galaxies that stopped forming stars in the distant past can be rejuvinated when clusters of galaxies merge, generating a cosmic shock wave that triggers the birth of a new generation of stars.