Expansion Rate : The Hubble Tension

When the Hubble Space Telescope launched , one of its main goals was to measure the rate at which our universe is expanding .

That rate is called the " Hubble Constant " - named after the astronomer Edwin Hubble , who contributed to the discovery of the universe's expansion . However , the expected value of the expansion rate is different depending on what equipment is being used to determine it .

In this video , Nobel Laureate Dr. Adam Riess explains this phenomenon known as " Hubble Tension , " and how important this mystery is to our understanding of the universe .