“The circumgalactic medium plays a huge role in that cycling of that gas. So, being able to understand what the CGM looks like around galaxies of different types — ones that are star-forming, those that are no longer star-forming, and those that are transitioning between the two — we can observe [how] changes in this reservoir may actually be driving the changes in the galaxy itself.”
As technology evolves astronomers will likely be able to look at the CGM of other more distant galaxies and learn more about them as well.
The colliding of galaxies sounds terrifying.
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