Galaxy Cluster's 'Colossal Arms' Revealed In X-Rays | Video
The Coma Cluster of galaxies' hot gas arms, spanning at least a 1/2 million light years, have been unveiled by combining images from the Chandra and XMM-Newton x-ray Observatories. They're a byproduct of smaller galaxies merging with the cluster.
Credit: NASA/CXC/A. Hobart