Zachary Raha was the kind of kid who always had a side project. Today, Raha—who recently completed a Science Undergraduate Laboratory Internship (SULI) with Nobel laureate Saul Perlmutter of the Physics Division—keeps himself busy with maps of a different scale: the expansion history of the universe as illustrated by Type Ia supernovae.
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Using an automated supernova-hunting pipeline based at NERSC, astronomers have captured multiple images of a gravitationally lensed Type Ia supernova. This detection is currently the only one of its kind, but astronomers believe that if they can find more, they may be able to measure the rate of the universe’s expansion within 4 percent accuracy. Two Berkeley Lab researchers have a method for identifying more of these events using existing wide-field surveys.