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NASA announced Thursday that its Hubble Space Telescope (HST) has calibrated more than 40 “mile markers” for space and time.
Kilometer markers help scientists measure the universe’s expansion rate, and using data from HST and other telescopes, astronomers have identified a discrepancy between the expansion rate measured in the local universe and independent post-Big Bang observations.
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The reason for the discrepancy is still unknown, however NASA says HST data supports new physics.
The expansion rate of the universe the so-called “Hubble constant”, After Edwin Hubble.
He was the first to calculate the constant from his measurements of stars in 1929, and can be used to predict how fast astronomical body At a known distance from Earth.
However, the true value of the Hubble constant is still up for debate, according to the University of Chicago, Hubble University.
Cepheids, or stars that periodically fade in brightness, have long been the gold standard for cosmic mile markers. For longer distances, astronomers use exploding stars, so-called Type Ia supernovae.
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In new research, a nationwide scientific collaboration called SH0ES (Supernova, H0, for Dark Energy Equation of State) has measured 42 supernova signs using Hubble.
“The SH0ES project was designed to clamp the Universe by matching the accuracy of the Hubble constant derived from studying the residual cosmic microwave background from the dawn of the Universe,” NASA wrote in a statement.
The project’s results were more than double those of the previous cosmic range marker sample.
The agency also explained that the universe’s expansion rate was expected to be slower than what Hubble actually sees, with a lower value of the Hubble constant calculated using the Standard Cosmological Model of the Universe and measurements from the European Space Agency’s Planck mission was calculated as the SH0ES team estimated.
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Nobel laureate Adam Rees of the Space Telescope Science Institute (STScI) and Johns Hopkins University, who leads SH0ES, said that — given Hubble’s large sample size for tilt markers — the chance for astronomers is one in a million. not correct.
NASA’s new Webb Space Telescope It will extend HST’s work by showing kilometer markers from a greater distance.