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'Cosmic Tsunami'

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'Cosmic Tsunami' Shocks 'Sausage' Galaxy Cluster Into Star

A so-called “cosmic tsunami” is rousing a galaxy cluster affectionately nicknamed “Sausage,” suggesting that stagnant galaxies can be rejuvenated when galactic clusters collide, scientists say.

Astronomers made the discovery while studying CIZA J2242.8+5301, an ancient galaxy cluster 2.3 billion light-years from Earth. The cluster (yes, they actually call it Sausage), which is full of old red stars, is waking up as a shock wave triggers new star formation. The shock wave from the cluster’s collision, which scientists compared to a tsunami, began 1 billion years ago and is moving at a mind-boggling speed: 5.6 million mph (9 million km/h).

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Edited by Anomalocaris
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