The Hubble Space Telescope has helped scientists understand that the universe is expanding at an accelerating rate, all while uncovering a mysterious wrinkle that only brand-new physics may solve
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Measuring the expansion rate of the universe was one of the Hubble Space Telescope's main goals when it was launched in 1990.
Over the past 30 years, the space observatory has helped scientists discover and refine that accelerating rate -- as well as uncover a mysterious wrinkle that only brand-new physics may solve. Hubble has observed more than 40 galaxies that include pulsating stars as well as exploding stars called supernovae to measure even greater cosmic distances. Both of these phenomena help astronomers to mark astronomical distances like mile markers, which have pointed to the expansion rate.
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