Supernovae are the most powerful explosions in the universe.  DJ Superdupernova (aka. Dr. Jeffrey Silverman) explains the origin of these celestial events, breaking down the different types and sub types.  One famous subtype, "Type Ia" is really useful as a "standardizable" candle, which means that we know the absolute luminosity of the stellar explosion, and can therefore calculate its distance.  The standardizable Type Ia supernovae reveal that the universal expansion is accelerating.  DJ R-naught gets downright frightened of dark energy!  Dr. Silverman is a National Science Foundation Postdoctoral research fellow at the University of Texas at Austin's Department of Astronomy.

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