365bet中国官方网站

  • word of the day

    hubble parameter

    hubble parameter - 365bet中国官方网站 definition and meaning for word hubble parameter

    Definition
    (noun) (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
  • Download our Mobile App Today