The Big Bang
- Created by: emily_w
- Created on: 09-04-14 16:10
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- The Big Bang
- Evidence
- COBE
- launched 18th Nov., 1989
- discovered that young universe was not uniform
- scientists used COBE's data to create CBMR maps
- WMAP
- probe similar to COBE, more detailed map of CMBR
- Discoveries
- Universe is 13.7bn years old
- stars started appearing 200m years after Big Bang
- 23% of Universe is dark matter, 73% is dark energy
- launched June 2001
- COBE
- Discovery
- Hubble's Law
- shows how fast galaxies are moving away from us
- Equation: Recession velocity=H0 x distance from Earth
- H0=Hubble constant, or the gradient of the graph
- steeper graph, younger universe
- When Hubble was making the Tuning Fork diagram, he realised some galaxies had been redshifted
- Hubble realised that the Universe must be expanding if galaxies are moving away from us
- would have had to been a starting point, ie. the Big Bang
- Hubble's Law
- Other theories
- Steady State theory
- developed in 1948 by Sir Fred Hoyle
- universe has always existed without changing
- universe produces matter at a constant rate to maintain density
- did not explain origin of the universe
- Multiverse theory
- collision of two universes triggered the big bang to form ours
- only now becoming more prominent
- could work because spacetime stretches indefinitely, pattern in which atoms are arranged has to start repeating
- Steady State theory
- CMBR
- background noise of the Universe
- discovered in 1965 by Arno Penzias and Robert Wilson
- can only be detected with radio telescopes
- spread evenly throughout the Universe
- supports the BBT because it is the afterglow from the creation of the Universe, and there must have been a big event to cause it
- solid proof for the Big Bang theory
- Evidence
- can only be detected with radio telescopes
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