A team of U.S. astronomers has used the NASA/ESA Hubble Space Telescope to make a new measurement of the Hubble constant, the rate at which the Universe is expanding. The results, to be published in the Astrophysical Journal, are forcing the scientists to consider that they may be seeing evidence of something unexpected at work in the Universe. These Hubble images showcase two of the 19 galaxies analyzed in a project to improve the precision of the...