We watched a classic video about the size of the universe called 'Powers of Ten' - I can't find this original version on the web, but here is part of a good quality remake which just does 'zooming out':
POWERS OF TEN... the unimaginable size of our universe
This one does the 'zooming in' from the whole universe to the insides of a proton in the nucleus on a carbon atom in a strand of DNA in the nucleus of a single-celled organism in a drop of water on a blade of grass!
Powers of 10
As well the order of sizes of moons, planets, stars and galaxies, you need to be able to explain what 'red-shift' is, and how the amount of red-shift from galaxies relates to their distance from us, and why this is evidence for the expansion of the entire universe, and therefore for the 'big bang' theory. This video explains this quite nicely:
Hubble's Expanding Universe Red Shifts The Big Bang
But you will probably enjoy this one more:
Sciencerapper
The evidence that led to the 'big bang' theory taking over from the 'steady state' theory was 'cosmic background radiation'. This is explained (with a lot more detail than you need to know) here:
Big Bang Cosmology: Looking Back To The Dawn Of Time
This sheet has the question we did in our lesson on Friday, plus an extra question which involves some research and plotting a graph:
Red shift questions
Here are some extra questions for optional homework - if you want some more practice with this:
Beyond the Earth questions
Big Bang sheet
Answers to all of these to follow in a future post!
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