NASA's Hubble Space Telescope has calibrated approximately 40 mile markers to better measure the expansion rate of the universe. However, scientists have found a discrepancy.
He was the first to calculate the constant from his measurements of stars in 1929, and it can be used to predict how fastHowever, the true value of the Hubble constant remains up for debate, according to the University of Chicago, Hubble's alma mater.
Cepheids, or stars that periodically brighten and dim, have long been the gold standard of cosmic mile markers. For greater distances, astronomers use exploding stars called Type Ia supernovae.In a new paper, a nationwide scientific collaboration called SH0ES measured 42 of the supernova milepost markers with Hubble.
"The SH0ES project was designed to bracket the universe by matching the precision of the Hubble constant inferred from studying the cosmic microwave background radiation leftover from the dawn of the universe," NASA wrote in a release.
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