An image from NASA’s Hubble Space Telescope of galaxy cluster MACS J0417 is part of repeated observations to monitor for the reappearance of supernova Athena, which can help astronomers measure the expansion rate of the universe.
Image Credit: NASA, ESA, STScI, M. Pascale (UCLA); Image Processing: J. DePasquale (STScI)
https://www.nasa.gov/image-detail/stsci-h-p26023a-m-2000×1207/