(First of all, remember that May 25 is Towel Day! See "Towel Day ~ May 25," below.) And now to the matter at hand, which revolves around NASA scientists creating a computer simulation of galaxies in order to determine how they grow. Creating the simulation is a bit like playing chess, according to Alyson Brooks, an expert in galaxy simulations at the University of Wisconsin, Madison: "For each point in time, we have to figure out how a given particle ~ our chess piece ~ should move based on the positions of all of the
other particles."
What Brooks and the rest of the team found is that cold gas spirals along filaments into the center of the galaxies, where it's transformed into new stars: http://www.jpl.nasa.gov/news/news.php?release=2013-174&cid=release_2013-174
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