Now, we’ve made our way to “U,” which stands for universal expansion.
In 1929, Edwin Hubble looked through his telescope and observed a red shift on all observable galaxies and stellar groups in the universe. A red shift is like a doppler effect. When you look at the red end of the spectrum, and you see light coming from a distant body that’s at the red end of the spectrum, it indicates that that body is moving away from you. If the body was moving towards you, the light would be on the violet end of the spectrum. If you want to get really mathematical and scientific, you can check out this website.
Before we move on, I want to be sure you notice this one thing. If you look at the link above, the author explains how researchers have calculated that the universe is 13.7 billion years. Whether you believe in an old earth or a young earth, these researchers have concluded that the universe has an age. If the universe has an age, that means that the universe is not infinite. It is finite. It had a beginning.
Anyway, back to “U”. Everything Hubble saw was at the red end of the spectrum, which indicated that the everything was moving away.Expansion. This observation was evidence that supported what had been indicated in Einstein’s theory of relativity in 1915. If the universe has a finite beginning point in the past, then as we move forward in time, the universe must be expanding. Edwin Hubble observed that the universe is getting bigger in the present. This observation is confirmation that not only does the universe have a beginning, but the universe has a beginning in which the universe is much more condensed.
Tune in next time for “R”!