Hubble’s measurements of today’s expansion rate do not match the rate that was expected based on how the Universe appeared shortly after the Big Bang over 13 billion years ago.
Using new data from the NASA/ESA Hubble Space Telescope, astronomers have significantly lowered the possibility that this discrepancy is a fluke.
Using new observations from the NASA/ESA Hubble Space Telescope, researchers have improved the foundations of the cosmic distance ladder, which is used to calculate accurate distances to nearby galaxies.
When defining the distances to galaxies that are further and further away, these Cepheid variables are used as milepost markers.
Researchers use these measurements to determine how fast the Universe is expanding over time, a value known as the Hubble constant.