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They’re not even pretending that it’s for any kind of legitimate reason. Instead, they’re trying to dismantle NCAR to suppress knowledge.

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Normal star with a compact (dwarf, neutron star, black hole) companion. Gas flows down onto the compact companion, shocks form, gas heats up, emits X-rays. The model calculated what the resultant spectrum would look like as the X-rays excited the surrounding gas. Lots of atomic physics.