Lars Bildsten (UCSB) was at NYU today, so much of the day was spent talking about nuclear astrophysics, including supernovae and the structure and cooling of white dwarfs. In his talk, Bildsten showed good empirical evidence that there are at least two different types of type Ia supernovae; this goes some way towards resolving a long-standing discrepancy between the observed Ia rate and iron abundance in galaxy clusters, and also the evolution in rate density as a function of redshift.
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