In one of the nearest big galaxies , M82 , a rare type of star exploded . Meg ##ler : Its uniform luminosity makes it valuable in measuring cosmic distance . She says finding supernovae has led directly to the discovery of dark energy . Chris : We are seeing this light 11.4 billion years after the real one .
In one of the nearest big galaxies , M82 , a rare type of supernova exploded . Meg Urry : Its uniform luminosity makes it valuable in measuring cosmic distance . She says finding supernovae has led directly to the discovery of dark energy . Urry : We are seeing this light 11.4 million years after the real explosion .