• The study of the Universe is called cosmology.
  • Cosmologists study the structure and changes in the present Universe.
  • The Universe contains all of the star systems, galaxies, gas, and dust, plus all the matter and energy that exists now.
  • Plus all that existed in the past, and all that will exist in the future.
  • The idea of a Universe has changed through human history.
  • Edwin Hubble determined that there was much more to space than our own galaxy.
  • Today, we know that the Universe contains about a hundred billion galaxies.
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