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CMB-S4 is the next-generation ground-based cosmic microwave background experiment.
With arrays of large- and small-aperture telescopes surveying the sky with hundreds of thousands of cryogenically-cooled superconducting detectors, CMB-S4 will deliver transformative discoveries in fundamental physics, cosmology, astrophysics, and astronomy.
CMB-S4 is supported by the Department of Energy Office of Science and the National Science Foundation.