Wednesday, November 6, 2019

11 Billion Years Ago

Image: © DESI Collaboration; Legacy Surveys; NASA/JPL-Caltech/UCLA
DESI is designed to provide precise measurements of the rate of expansion of the universe. To figure out how much of the universe expanded as light from different galaxies traveled to Earth, the instrument will detect light from a particular set of galaxies, split that light into narrow bands of color and use each of those bands to measure the galaxies' distances from our planet.

What's more, DESI will be able to peer into the distant, early universe, going back in time to about 11 billion years ago. At that time, gravity is thought to have slowed the universe's expansion, whereas now, dark energy is thought to be speeding the expansion up.  --- LiveScience

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