Jul 12, 2018

Hubble, Gaia produce most precise measure of universe’s expansion rate

Posted by in category: space

July 12 (UPI) — By combining the observations of the two most powerful space telescopes in orbit, scientists have achieved the most precise measurement of the Hubble constant, the universe’s expansion rate.

The new measurement confirms the tension between explosion rate in the early and late universe, researchers report.

Astronomers can measure the expansion of the universe by measuring a galaxy’s redshift, a change in the wavelength of the light due to a change in the velocity of the object. By measuring the redshift of galaxies using the Hubble Telescope, scientists have established the Hubble constant.

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