The Hubble telescope just made its best measurement yet of the universe's current expansion rate, but it still doesn't match the early universe.
Riess has affiliations at the Space Telescope Science Institute that manages Hubble, as well as the Johns Hopkins University in Baltimore, Maryland.
Hubble's data nailed down its observed expansion rate under a program called SHOES The dataset doubles a previous sample of measurements and also includes more than 1,000 Hubble orbits, NASA stated. The new measurement is also eight times more precise than expectations for Hubble's capabilities. Cepheids are good for charting distances that are inside the Milky Way and in nearby galaxies. For further distances, astronomers rely upon. These supernovas have a consistent luminosity , allowing for precise estimates of their distance based on how bright they appear in telescopes.