Hubble Constant
The age of the Universe can be calculated from te Hubble constant HO. Its age is equal to this constant.
The WMAP satellite has been sent in 2001 to measure accurate data of this fossil ray. This value of HO has been measured equal to 71 kilometers per second and per megaparsec (1 million of parsecs), at 5% of innacuracy.
The picture taken in 2003 per the WMAP satellite shows the ray in the Universe.
Picture credit : NASA / WMAP
See Big Bang, Constant of Planck, Distance of Planck, Time of Planck
