Herschel and Planck Identify Some of the Oldest and Rarest Galaxy Clusters

By using data from ESA’s Herschel and Planck space observatories, astronomers have discovered what could be the precursors of the vast clusters of galaxies that we see today. One telescope finds the treasure chest, and the other narrows in on the gold coins. Data from two European Space Telescope missions, Planck and Herschel, have together […]
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