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A "galactic fountain" is _____.a.a jet of high-speed superheated material thrown out of the accretion disk around a black holeb.a partial spiral arm formed by the collision of molecular cloudsc.a bubble of hot, metal-rich gas ejected from the disk by a burst of supernovad.a stream of gas made from a star that has been torn apart while falling into a supermassive black holee.a stream of gas and dust being pulled into a galaxy as it forms
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