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The universe is expanding faster than theory predicts – physicists are searching for new ideas that might explain the mismatch

  • Written by Ryan Keeley, Postdoctoral Scholar in Physics, University of California, Merced
The universe is expanding faster than theory predicts – physicists are searching for new ideas that might explain the mismatchThe James Webb Space Telescope's deep field image shows a universe full of sparkling galaxies.NASA/STScI

Astronomers have known for decades that the universe is expanding. When they use telescopes to observe faraway galaxies, they see that these galaxies are moving away from Earth.

To astronomers, the wavelength of light a galaxy emits is longer the...

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