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

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.