A million-second-long exposure by Hubble reveals the first galaxies to emerge from the so-called 'dark ages.

A million-second-long exposure by Hubble reveals the first galaxies to emerge from the so-called "dark ages," the time shortly after the big bang when the first stars reheated the cold, dark universe. Credit: NASA, ESA, S. Beckwith (STScI) and the HUDF Team

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