Physicists have improved the accuracy of a technique that uses variable stars to measure distances in the universe, providing a new figure for its expansion rate.
"Thanks to this trick, we could take advantage of the best knowledge of Gaia's parallax measurements while benefiting from the gain in precision provided by the many cluster member stars," Anderson said."This has allowed us to push the accuracy of Gaia parallaxes to their limit and provides the firmest basis on which the distance ladder can be rested."Hubble constant
Scientists use a cosmic distance ladder to measure the expansion rate of the universe. The ladder, symbolically shown here, is a series of stars and other objects within galaxies that have known distances. By combining these distance measurements with the speeds at which objects are moving away from us, scientists can calculate that expansion rate.
. Since then, measuring the Hubble constant has become a thorny issue for astronomers and cosmologists, because there are two major ways of determining this value — and they don't agree. ' velocities as a function of distance to deliver a Hubble constant value of about 73 ± 1 kilometers per second per megaparsec , with 1 Megaparsec representing around 3.26 million light-years.
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