The cause of this discrepancy remains a mystery. In recent years, thanks to data from Hubble and other telescopes, astronomers found another twist: a discrepancy between the expansion rate as measured in the local universe compared to independent observations from right after the big bang, which predict a different expansion value.
In 1998, this led to the discovery of "dark energy," a mysterious repulsive force accelerating the universe's expansion. Pursuit of the universe's expansion rate began in the 1920s with measurements by astronomers Edwin P. Riess (STScI, JHU)Ĭompleting a nearly 30-year marathon, NASA's Hubble Space Telescope has calibrated more than 40 "milepost markers" of space and time to help scientists precisely measure the expansion rate of the universe-a quest with a plot twist. These two celestial phenomena are both crucial tools used by astronomers to determine astronomical distance, and have been used to refine our measurement of the Hubble constant, the expansion rate of the universe. This collection of 36 images from NASA's Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae.
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