The Origins of the Universe

1) Light from other galaxies is Red-Shifted

An example of Red-Shift

The Doppler Effect is the perceived change in frequency and wavelength of a wave [I actually knew that :)]

2) The further away a galaxy is, the greater its Red-Shift

The Big Bang Theory

According to the Big Bang Theory, all the matter and energy in the universe must have been massively compressed into one tiny space, before exploding from the single point and expanding.

The Steady State theory suggests that the universe has always existed as it does now and always will do, based on the idea that the universe appears basically identical everywhere.

The discovery of Cosmic Microwave Background Radiation (CMBR) is strong evidence that the Big Bang theory is the more likely theory.

While the Big Bang Theory is generally agreed upon as how the universe began, it does have limitations.