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Astronomers have taken a crucial step in showing that the most massive black holes in the universe can create their own meals. Data from NASA’s Chandra X-ray Observatory and the Very Large Telescope (VLT) provide new evidence that outbursts from black holes can help cool down gas to feed themselves.
https://en.wikipedia.org/wiki/Thermal_expansion
But this is the opposite, the colder gas is the one expanding and moving.