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History of the Universe

History of the Universe
This diagram traces the evolution of the universe from the big bang to the present. Two watershed epochs are shown. Not long after the big bang, light from the first stars burned off a fog of cold hydrogen in a process called reionization. At a later epoch quasars, the black-hole-powered cores of active galaxies, pumped out enough ultraviolet light to reionize the primordial helium.
  • Release Date
    October 7, 2010
  • Science Release
    Hubble Astronomers Uncover an Overheated Early Universe
    Read the release
  • Credit
    Credit: NASA, ESA, and A. Feild (STScI)

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Related Images & Videos

Helium Reionization in the Early Universe

Helium Reionization in the Early Universe

This ultraviolet-light data from the Hubble Space Telescope's Cosmic Origins Spectrograph shows strong helium II absorption and transmission lines from a quasar, identifying an era 11.7 to 11.3 billion years ago when electrons were stripped from primeval helium atoms – a process...

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Last Updated
Feb 17, 2025
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Media

Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov

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