Big Bang Theory
People believe that the universe originated sometime between 10-20 billion years ago from with a giant explosion of a small volume of matter at extremly high temperatures and density. This is called the “The Big Bang”. Prior to this moment there was nothing the Universe did not exist and it was a place where no life forms could survive. When this happened all time, space and matter began. The universe grew from a single atom and is constantly expanding to this very day. The creator of this theory was a man named Georges Lemaitre.
Hubble's Law-
Proof that this theory exists was first proposed by Edwin Hubble (1889-1953) in 1929 who discovered that galaxies appear to be moving away from us. This is called "Hubble's Law" . His observation supports the expansion of the universe and suggests that the universe was once tightly compacted.
CMBR-
Another theory that provides proof for the Big Band Theory is cosmic microwave background radiation (CMBR) that ws discovered by Radioastronomers Arno Penzias and Robert Wilson. They heard a strange buzzing sound coming thorugh their satellite; at first it was thought to be pigeon poo affecting the signal. However it was later discovered that it is the electromagnetic radiation left over from the occurrence of the big bang, therefore it is further proof that the Big Bang occurred
RED SHIFT-Edwin Hubble's redshift theory also supports the Big Bang. Redshift is when the light from a galaxy is moving away from you and the wavelength of the light appears longer. As it moves away it moves towards the red end of the spectrum and if it is moving towards you it appears blue. The fact that redshift is occurring is evidence that galaxies are moving away just as the Big Bang theory states.
DOPPLER EFFECT-
Another theory that supports the big bang is the doppler effect.The doppler effect was proposed in 1842 by Christian Doppler. It is the changes in sound as something moves towards you or away from you. Like with the redshift theory when the source of the sound moves away it changes to the red end of the spectrum and as it comes closer it goes to the blue end.
Hubble's Law-
Proof that this theory exists was first proposed by Edwin Hubble (1889-1953) in 1929 who discovered that galaxies appear to be moving away from us. This is called "Hubble's Law" . His observation supports the expansion of the universe and suggests that the universe was once tightly compacted.
CMBR-
Another theory that provides proof for the Big Band Theory is cosmic microwave background radiation (CMBR) that ws discovered by Radioastronomers Arno Penzias and Robert Wilson. They heard a strange buzzing sound coming thorugh their satellite; at first it was thought to be pigeon poo affecting the signal. However it was later discovered that it is the electromagnetic radiation left over from the occurrence of the big bang, therefore it is further proof that the Big Bang occurred
RED SHIFT-Edwin Hubble's redshift theory also supports the Big Bang. Redshift is when the light from a galaxy is moving away from you and the wavelength of the light appears longer. As it moves away it moves towards the red end of the spectrum and if it is moving towards you it appears blue. The fact that redshift is occurring is evidence that galaxies are moving away just as the Big Bang theory states.
DOPPLER EFFECT-
Another theory that supports the big bang is the doppler effect.The doppler effect was proposed in 1842 by Christian Doppler. It is the changes in sound as something moves towards you or away from you. Like with the redshift theory when the source of the sound moves away it changes to the red end of the spectrum and as it comes closer it goes to the blue end.
Steady State Theory
The steady-state theory is a theory that the universe is always expanding but still maintaining at a constant average density, matter always being created to form new stars and galaxies at the same rate that old ones become observable. The term 'steady state' means a stable condition that does not change over time or in which change in one direction is continually balanced by change in another.
The first person to put forward this theory was a man named Sir James Jeans in about 1920. It was then revised afterwards in 1948 by Hermann Bondi and Thomas Gold. Further on it was developed by Sir Fred Hoyle to deal with some issues that came in connection with the big-bang hypothesis. Observations since the 1950's have produced much evidence contradictory to the steady-state picture and supportive of the big-bang model. The Steady State Theory states that although the universe is expanding, it does not change its look over time. For this to work, new matter must be formed to keep the density equal over long periods of time.
RED SHIFT-
The Redshift theory provides evidence for the steady state theory also because it proves that our galaxy is expanding. According to the redshift theory when something moves away it shifts towards the red end of the spectrum. As our galaxy expands the stars appear redder and darker therefore proving some elements of the steady state theory.
The first person to put forward this theory was a man named Sir James Jeans in about 1920. It was then revised afterwards in 1948 by Hermann Bondi and Thomas Gold. Further on it was developed by Sir Fred Hoyle to deal with some issues that came in connection with the big-bang hypothesis. Observations since the 1950's have produced much evidence contradictory to the steady-state picture and supportive of the big-bang model. The Steady State Theory states that although the universe is expanding, it does not change its look over time. For this to work, new matter must be formed to keep the density equal over long periods of time.
RED SHIFT-
The Redshift theory provides evidence for the steady state theory also because it proves that our galaxy is expanding. According to the redshift theory when something moves away it shifts towards the red end of the spectrum. As our galaxy expands the stars appear redder and darker therefore proving some elements of the steady state theory.