skrev:
Hello.

This is a strictly technical question related to famous
Cosmic Microwave Background problem. As we know
a couple of years ago Wilkinson Microwave Anisotropy
Probe has measured detailed temperature of CMB with
accuracy of 5 places after the dot, so it's value is now
assumed to be 2,726xx degree Kelwin (correct me
please with the exact number).

No, this is not what has been done. WMAP is measuring
temperature differences in the black body radiation from
different directions on the sky with an accuracy of better
than one part in 10e5, but the mean temperature is not known
with this precision. As a matter of fact, I do not think
it has really been measured since the COBE satellite in 1990.

Ulf Torkelsson