DR WILLIAM HSIN-MIN KU / SCIENCE PHOTO LIBRARY DR WILLIAM HSIN-MIN KU / SCIENCE PHOTO LIBRARY
X-ray image taken with the Einstein Observatory satellite of the Hydra A Cluster of galaxies. The strength of the X-ray emission runs from red up to white for the brighter regions. The X-ray image does not show the single galaxies, as the optical images, but reveals a huge region of gas permeating all the cluster. The temperature of the gas is about 100 million degrees and is invisible except to the X-ray telescopes.
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