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The Expanding Universe

The Expanding Universe
This diagram shows how the universe slowed down and then revved up since the Big Bang. The concentric red circles denote that galaxies are migrating apart at a slower rate during the first half of the cosmos. Than a mysterious dark force overcame gravity and began pushing galaxies apart at an ever-faster rate, signified by the green circles. Astronomers found evidence of the universe's deceleration when they observed the farthest supernova ever seen, which detonated so long ago that the universe was still slowing down.
  • Release Date
    April 2, 2001
  • Science Release
    Blast from the Past: Farthest Supernova Ever Seen Sheds Light on Dark Universe
  • Credit
    Credit: Ann Feild (STScI)

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Last Updated
Mar 28, 2025
Contact
Media

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