- #1
MathJakob
- 161
- 5
Why is Hubble's constant called a constant if it isn't constant?
As of 20 December 2012 the Hubble constant, as measured by NASA's Wilkinson Microwave Anisotropy Probe (WMAP) and reported in arxiv, is 69.32 ± 0.80 (km/s)/Mpc (or 21.25 ± 0.25 (km/s)/Mega-lightyear). [Reference]
As of 21 March 2013, the Hubble constant, as measured by the Planck Mission, is 67.80 ± 0.77 (km/s)/Mpc. [Reference]
As of 20 December 2012 the Hubble constant, as measured by NASA's Wilkinson Microwave Anisotropy Probe (WMAP) and reported in arxiv, is 69.32 ± 0.80 (km/s)/Mpc (or 21.25 ± 0.25 (km/s)/Mega-lightyear). [Reference]
As of 21 March 2013, the Hubble constant, as measured by the Planck Mission, is 67.80 ± 0.77 (km/s)/Mpc. [Reference]