Abstract:
If one force could be held accountable for the universe, then it should be gravity. Interacting galaxies pull gas into spiral arms, leading to collisions between cold clouds that trigger the collapse of stars and the formation of their planet-forming discs. In this talk, I'll introduce projects on two completely different scales in which gravity is equally guilty. The first part will be on the galaxy-scale, looking at interactions between star-forming clouds in computer (AMR) simulations, and how much this gas cares about its galactic environment. The second part will focus on my newest work on the effect of planetesimal accretion on planet atmospheres (giving the latter as much time as I can reasonably justify for a project still in early stages!)