ACS first light images after the switch to the spare (side 2) electronics, after the failure of the side 1 power controller.
Found a redshift =1.4 supernova (~ 9 billion light years away), as part of Perlmutter's (LBL) high redshift supernova search, which is looking for additional date on the accelerating expansion of the universe and hence further confirmation of and testing of Dark Energy
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