Space Telescope Key Project Completes Task of Measuring the Hubble Constant Within 10%
AUG 01, 1999
By measuring hundreds of periodically varying stars out to 80 million light‐years, the Hubble telescope has calibrated much brighter cosmological yardsticks that we can see billions of light‐years away.
DOI: 10.1063/1.882773
Five years before the Hubble Space Telescope was launched in 1990, NASA designated a “Key Project” for the orbiting telescope. The project’s goal was to pin down the Hubble constant
© 1999. American Institute of Physics
