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Sagot :
Along with cold gas that appears to be falling from the halo, we also observe hot gas far above the portion of the disk close to our solar system. This observational evidence supports the galactic fountain model, which describe how gas cycle between the disk of the galaxy and regions high above the disk.
What is the model for the galactic fountain?
The idea that hot, ionized gas that super bubbles blow off of the galactic disk and into the halo cools and returns to the disk.
What might start an interstellar fountain?
In this Milky Way graphic, the galactic fountain scenario is depicted. Supernova explosions in the galactic disc heat the interstellar medium and can force hot gas out of the disc, leading to the creation of so-called galactic fountains, which help build a halo of hot gas around the Milky Way.
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