Saturday, April 27, 2019 | Sacramento, CA | Permalink Seth Borenstein, Associated Press (AP) — The universe is expanding faster than it used to, meaning it's about a billion years younger than we thought, a new study by a Nobel Prize winner says. And that's sending a shudder through the world of physics, making astronomers re-think some of its most basic concepts. At issue is a number called theHubble constant,a calculation for how fast the universe is expanding.