B&W version of WFPC2/ACS, both I-band, before and during SN, with labels

Black and white version of [Left] - A Hubble Space Telescope image of a portion of the Hubble Deep Field North as originally photographed in 1995 with the Wide Field Planetary Camera 2 . [Right] - An image of the same field as imaged by Hubble's Advanced Camera for Surveys (ACS). The ACS observations were made in May and June 2002. The supernova is estimated to be 8 billion light-years away. Distant supernovae are used by astronomers to fill in the blank region where the universe's rate of expansion switched from deceleration due to gravity to acceleration due to the repulsive force of 'dark energy.'