Space (part 2)
- Created by: theninjaemu
- Created on: 14-04-16 18:44
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- Space
- Galaxies, stars and lightyears
- Stars form spiral arms due to gravity to make galaxies
- A lightyear is the distance light travels through a vacuum in one year
- When a large star uses up all its fuel and explodes, it creates a black hole
- They have a large mass, small volume and a high density
- They are not visible
- Scientists use x-rays emitted from other stars as they go into black holes to observe them
- Manned and unmanned probes
- Manned
- Lots of fuel would be needed
- Needs to carry food, water and oxygen for the people
- Can be psychologically stressful
- Unmanned
- Doesn't need to carry food, water or oxygen
- Cheaper than manned
- Maintenance can't be carried out
- Manned
- Origin of the universe
- Red shift
- More distant galaxies have greater red shift than nearer ones
- This means they are moving away faster
- Microwave radiation
- Can be detected from all parts of the universe
- It is known as cosmic background radiation
- It is evidence of an initial "big bang"
- Red shift
- Galaxies, stars and lightyears
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