How does a blueshift give evidence to the big bang theory?

1 Answer
Apr 4, 2018

Actually a blue shift would be evidence of a contracting universe.
The red shift is the evidence of the big bang and an expanding universe.

Explanation:

As objects move away from an observer the wavelengths are stretched, creating longer wavelengths. The longest wavelengths of visible light are the red wavelengths. As objects move toward an observer the wavelengths are shorten. Blue wave lengths are shorter than average wavelengths of visible light.

What Hubble observed is that the universe has an overall red shift in visible light. This means that the universe is expanding moving away from the observers. It is this observation of the red shift that gave rise to the theory of the Big Bang.

Before Hubble scientists believed in the steady state universe that was thought to be eternal and self existent. Hubble's observation of the red shift proved that the universe had a beginning, the Big Bang.

In 1997 and 1998 three groups of scientists studied the standard candle of the supernovas. This groups expected to see a blue shift in the supernovas a decrease in the expansion of the universe. The theories of the oscillating universe that matter and energy recycled predicted the decreasing velocity of the expansion of the universe. These studies found just the opposite the rate of the expansion of the universe is increasing, This means that not only did the universe have a beginning it will also have an ending. There was no overall blue shift in light.