Image of the Day: Gigantic Galaxy String Defies Age of Universe

String-of-galaxies

Wide-field telescope observations of the remote early Universe, looking back to a time when it was a fifth of its present age (redshift = 2.38), have revealed an enormous string of galaxies about 300 million light-years long. This new structure defies current models of how the Universe evolved, which can't explain how a string this big could have formed so early.

Image credit: NASA/Hubble

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