When it comes to measuring how fast the Universe is expanding, the result depends on which side of the Universe you start from. An EPFL study has calibrated the best cosmic yardsticks to unprecedented accuracy, shedding new light on the Hubble tension. The Hubble tension, a discrepancy in the cos
This Hubble image shows RS Puppis, a type of variable star known as a Cepheid variable. As variable stars go, Cepheids have comparatively long periods — RS Puppis, for example, varies in brightness by almost a factor of five every 40 or so days. RS Puppis is unusual; this variable star is shrouded by thick, dark clouds of dust enabling a phenomenon known as a light echo to be shown with stunning clarity. Credit: NASA, ESA, and the Hubble Heritage Team -Hubble/Europe Collaboration.
the most detailed physical understanding of how the Universe evolves, rendering it model dependent. The ESA’ssatellite has provided the most complete data on the CMB, and according to this method, H0 is 67.4 ± 0.5 km/s/Mpc. “Our study confirms the 73 km/s/Mpc expansion rate, but more importantly, it also provides the most precise, reliable calibrations of Cepheids as tools to measure distances to date,” says Anderson. “We developed a method that searched for Cepheids belonging to star clusters made up of several hundreds of stars by testing whether stars are moving together through theparallax measurements while benefiting from the gain in precision provided by the many cluster member stars.
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