Distance to the Virgo cluster galaxy M100 from Hubble Space Telescope observations of Cepheids

Use of the Hubble Space Telescope to determine the distance to the Virgo cluster galaxy yields a new value for the Hubble constant at 80 plus or minus 17 kilometers per second per megaparsecs. The Hubble constant, which provides the expansion rate of the universe, is the ratio of the recession velocity to the distance for a galaxy.