-
Vesto Slipher was the first man to observe that nebulas were moving away from earth. He measured spectral lines of light from different galaxies.
-
Georges Lemaitre was a priest and a mathematician. He was the one who came up with the Big Bang Theory. Georges Lemaitre published this theory in Annales de la Societe Scientifique de Bruxelles. The big bang theory is that the universe began as a single point, then expanded and stretched to grow as large as it is right now
-
Edwin Hubble was the one who proposed the law of redshifts. The law's other name is Lemaître Law. This law explains that the farther away a galaxy is from the earth the faster it is moving.
-
Steady-State Theory was proposed by three men; Fred Hoyle, Thomas Gold, and Hermann Bondi. This theory explains that the universe is always expanding, but stays at the same density.
-
In 1965, Arno Penzias and Robert Wilson were studying and mapping the signals from the Milkyway. They also discovered Cosmic Microwave Background radiation at -454 degrees Fahrenheit This discovery backed up the theory that the big bang was caused by extreme heat.
-
In 1990 the Hubble telescope is launched into space. This telescope was able to help scientists further understand the mysteries of space.
-
In 1992 NASA launched COBE. This satellite was launched to find radiation throughout the universe. The image that Cobe produced showed thermal imaging that showed the radiation throughout the universe.
-
While The Big Bange theory was being further studied and observed the discovery occurred in Dark energy.
-
In May of 2000 Quasars were discovered. The discovery of Quasars
backed up the big bang theory and went against the Steady State theory. Since these objects are only found along the outskirts of the universe it backs up the theory that the big bang is constantly expanding.
