Cosmology. Dr Katy Lancaster. Overview. The Big Bang Formation of the Universe The Cosmic Microwave Background The COBE experiment The Expanding Universe Redshift Hubble’s Law The age of the Universe The Fate of the Universe The critical density Big crunch or big chill?.
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Dr Katy Lancaster
Cosmology:‘The science or theory of the universe as an ordered whole, and of the general laws which govern it. Also, a particular account or system of the universe and its laws.’
The Cosmological principle:‘The Universe, on average, looks the same from any point and in all directions.’
IN THE BEGINNING…….
Charged particles - photons scatter (like ‘fog’)
Much cooled, atoms form, photons escape
Remnant heat of the creation of the Universe
Recessional velocites (Doppler effect)
Distances derived using ‘standard candles’
Less dense: Expansion rate increases
More dense: Universe will collapse
Accelerating: Dark energy???