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With their highly energetic radiation, they heat up and ionize the surrounding gas.  Moreover, at the end of their life, stars explode in supernovae, which create swirl in the gas around them.  But this gas is also the main material use to grow the next generation of stars, and a change in his state could have consequence on the star formation rate of the futures generations.  To study of these this  intense period of change, induced by a complex coupling into different physics, we need to use numerical simulations.