Chemistry - Big Bang
- Created by: LunaShomeiRose
- Created on: 13-04-19 13:34
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- Big Bang
- Explains why more distant galaxies emit greater red shift light (universe expanding)
- Suggests universe began as small dense hot region. Matter started rapidly expanding. Planets/stars formed as gravity brings matter together. Expanding slows.
- Evidence: Light from distant Galaxies red shifted (moving away faster then close galaxies) - implies metter's moving away from matter (can't assume earth's in middle)
- Universe end
- The Big Freeze / the Big Rip
- Expanding continues and matter keeps spreading out, resulting in stars/planets/galaxies no longer existing
- Likely if universe density = or less then critical density
- The Big Crunch
- Expanding stops + gravity becomes dominant force & universe collapses
- Likely if universe is greater than critical density
- The Big Freeze / the Big Rip
- Dark Matter
- Some observations of universe can't be explained - Proposed explanations = dark matter
- Potential presence of matter - affects density + future of universe
- Some observations of universe can't be explained - Proposed explanations = dark matter
- Dark energy
- Universe expanding quicker - gravity results in force between matter - scientists suggest unknown energy source that results in resultant force
- Theories - need evidence to be commonly accepted
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