In 1929, a Cal-Tech astronomer named Edwin Hubble observed that objects which appeared to be much further away showed a more pronounced shift towards the red end of the spectrum. Scientists building on Hubble's discovery concluded that the farther an object was away from Earth, the faster it was receding, and calculated the relationship between distance and velocity, called the "Hubble Constant" and concluded on the basis of this one observed fact and the assumption that there was no other explanation for that observed fact that the universe was expanding. Religious circles embraced the idea.