The observations of Edwin Hubble in 1929 suggested that distant galaxies were all apparently moving away from us, so that many scientists came to accept that the universe was expanding. These scientists however did not include Hubble himself. While the metric expansion of space reading of Hubble's 1929 observations is viewed today by most scientists as the correct reading of the data, Hubble wrote six years later:
QUOTE (E. Hubble)
"... if redshift are not primarily due to velocity shift
- E. Hubble, Ap. J., 84, 517, 1936
"[If the redshifts are a Doppler shift]
- E. Hubble, Monthly Notices of the Royal Astronomical Society, 97, 506, 1937
Mistake is the assumption that cosmic red shift is due to Doppler effect.
Existence of gravitational constant means that light is red-shifted due to repulsive gravity effect on very large distances.
Even Einstein himself apparently has been fooled by "expanding universe" idea and didn't finished his works based on cosmological constant. Maybe this is a reason why he didn't succeed with his general relativity theory: due to misconception.
Today I'm convinced that "expanding universe" is one of biggest mistakes which Physics has ever made. That's why we hear this constant mumbling about "dark energy" and "dark mass":