Theory developed by physicist Fr.
Georges Lemaître, Ph.D. in 1927, that the universe is expanding outward from a specific point in the past. Galaxies are not moving through a fixed empty space, but rather the space between the galaxies is itself stretching and growing.
Red Shift
:
Phenomenon that is observed from our perspective on earth that as stars and galaxies move
away faster from us, the wavelengths of light they
emit have a longer wavelength and shorter frequency, making the light “shift” towards the red end of the electromagnetic spectrum.
