HDM has various meanings in the Astronomy category. Discover the full forms, definitions, and usage contexts of HDM in Astronomy.
Hot dark matter is a form of dark matter which consists of particles that travel with ultrarelativistic velocities. Dark matter is matter that does not interact with, and therefore cannot be detected by, electromagnetic radiation, hence dark. It is postulated to exist to explain how clusters and superclusters of galaxies formed after the Big Bang.
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