cooling gas of any galaxy cluster." How do you cool down a phoenix? I don't mean the mythological birds of flame and rebirth, but rather a cosmic namesake with a fittingly fiery nature.
An artist's concept shows the supermassive black hole at the center of the Milky Way galaxy, known as Sagittarius A* (photo credit: NASA, ESA, CSA, RALF CRAWFORD (STSCI)/HANDOUT VIA REUTERS ...
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