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Depicts: SN 1997ck Copyright: Peter Garnavich, Harvard-Smithsonian Center for Astrophysics, the High-z Supernova Search Team, and NASA Show in archive: true
These Hubble Space Telescope images pinpoint three distant supernovae, which exploded and died billions of years ago. Scientists are using
these faraway light sources to estimate if the universe was expanding at a faster rate long ago and is now slowing down.