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The Big Bang Theory
The cosmological principle




Hubble's Law
o Hubble realised universe is expanding
o Used type 1a supernovae and standard candles to calculate the distances to galaxies, and
measuring red shift
o Speed the galaxies moved away from Eath depended on how far they were away
o The…

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Age and size
t = distance 1
time = H


o absolute size of universe ­ unknown
o if H=75, radius of spehere = 13 bill. Years, with expansion of universe, radius = 46-47 bill
years


Dark energy
o expansion rate never been constant
o recently, expansion rate of universe…

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