Space (part 3)
- Created by: theninjaemu
- Created on: 15-04-16 10:46
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- Space
- The Big Bang
- Initially, all the matter in the universe occuped a very small space
- Then it 'exploded' under intense heat and pressure
- Estimates of the age of the universe are difficult, as it is hard to tell how much the rate of expansion has changed
- Life cycle of stars
- Initially, they form from clouds of dust and gas
- The force of gravity makes the gas and dust spiral together to form a protostar
- There is a stable period called a main sequence star and this lasts for several billion years
- The hydrogen runs out and it swells to a red giant
- A small star becomes unstable and forms a planetary nebula, then a white dwarf
- Big stars explode into a supernova, which then forms a neutron star or black hole
- Galileo and Copernicus
- Copernicus
- Copernican model states the sun is the centre of the universe (heliocentric)
- The planets orbit the sun
- Galileo
- Observed Venus had phases
- If Copenicus was right, Venus could move infront and behind the sun
- If the Ptolemaic model was right, Venus would always be infront of the sun
- Copernicus
- The Big Bang
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