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The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is a probe Class B mission designed to observe ultra-high energy cosmic rays (UHECRs) and cosmic neutrinos from space. Astro2020 APC white paper: Medium-class Space Particle Astrophysics Project Science White papers on Compact Objects and Energetic Phenomena; Galaxies; Cosmology.
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