Images of Galaxy Cluster in Dark Energy Study
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This one galaxy cluster is representative of over 80 clusters that
were used to track the effects of dark energy on these massive objects
over time. First shown in optical light, this galaxy cluster, Abell
85, is then seen in X-ray light from NASA's Chandra X-ray
Observatory. Most of the matter in galaxy clusters is in the form of
very hot gas, which emits copious amounts of X-rays. By studying
clusters across large distances, astronomers have determined that dark
energy has stifled their growth.
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Credits: X-ray (NASA/CXC/SAO/A.Vikhlinin et al.); Optical (SDSS)