Science Release: Hubble astronomers check the prescription of a cosmic lens

Cosmic lens MACS J1720+35 helps Hubble to find a distant supernovaTwo teams of astronomers using the NASA/ESA Hubble Space Telescope have discovered three distant exploding stars that have been magnified by the immense gravity of foreground galaxy clusters, which act like "cosmic lenses". These supernovae offer astronomers a powerful tool to check the prescription of these massive lenses.

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