Observations by the Hubble Space Telescope — like the Hubble Ultra Deep Field, which looks back to within a few hundred million years of the Big Bang — have helped to put cosmology on sound observational footing.
NASA, ESA, H. Teplitz and M. Rafelski/IPAC/Caltech, A. Koekemoer/STScI, R. Windhorst/Arizona State Univ., Z. Levay/STScI
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