The Stelliferous Era
COSMOS The Stelliferous Era

The Early Cosmos

The Early Stelliferous Era

   Cosmological timescale
      The Primordial Era
      The Stelliferous Era
   Geological timescale
Cosmic Evolution

Cosmos Main Page
   The Early Stelliferous Era
      Galaxies and Stars
      The Elements

History of the Universe
The History of the Universe, This diagram, read from the bottom to the top, 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 re-ionization. At a later epoch, quasars, the black-hole-powered cores of active galaxies, pumped out enough ultraviolet light to re-ionize the primordial helium. Image courtesy NASA, ESA, and A. Feild (STScI). Graphic and caption copied from Space com

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content by MAK110418. Edited RFVS111026