When the Hubble Space Telescope was launched in 1990 its main goal was to measure the expansion rate of the universe. For over 30 years, the observatory has helped scientists figure out and refine that accelerating rate. It also just uncovered a mysterious wrinkle that only brand-new physics may solve.
The telescope has observed more than 40 galaxies that involved pulsating starts as well as exploding stars. These type of phenomena let astronomers mark astronomical distances like mile markers. In 1998 astronomers discovered “dark energy” which is a repulsive force that accelerates the expansion rate.
Nobel Laureate Adam Reiss at the Space Telescope Science Institute said “you are getting the most precise measure of the expansion rate for the universe from the gold standard of telescopes and cosmic mile markers,”
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