Scientists talk about the universe being incredibly old and incredibly big... How do they know this?
Background radiation from the Big Bang, and red shift, amongst other things.
Here's a quick explanation of red shift: http://www.youtube.com/watch?feature=endscreen&v=3kw4id0NvJ0&NR
This BBC resource contains a lot of information about the Big Bang: http://www.bbc.co.uk/science/space/universe/questions_and_ideas/big_bang#p009fkpj
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