IP1.32.3 Evidence for the Big Bang © Oxford University Press 2011 Evidence for the Big Bang.
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IP1.32.3 Evidence for the Big Bang © Oxford University Press 2011 Evidence for the Big Bang
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Transcript of IP1.32.3 Evidence for the Big Bang © Oxford University Press 2011 Evidence for the Big Bang.
IP1.32.3 Evidence for the Big Bang
© Oxford University Press 2011
Evidence for the Big Bang
IP1.32.3 Evidence for the Big Bang
© Oxford University Press 2011
The Big Bang The Big Bang is the
most widely recognised scientific theory on how the Universe began.
It states that the Universe began from a very small, very dense and very hot initial point.
It burst outwards in a great explosion, and all matter and space was created in the Big Bang.
It is even thought that this was the moment when time began.
IP1.32.3 Evidence for the Big Bang
© Oxford University Press 2011
Evidence for the Big Bang – Red-shift
The first piece of evidence for the Big Bang is from data collected on red-shift.
Red-shift shows us that galaxies which are furthest away from us are moving faster than galaxies closer to us.
The galaxies are a bit like coloured sparks from an exploding firework. The sparks moving fastest travel the furthest.
If you could run time backward you would see the sparks all starting in one point. The same is true for galaxies.
IP1.32.3 Evidence for the Big Bang
© Oxford University Press 2011
Evidence for the Big Bang – Cosmic microwave background radiation
In the 1960s two scientists called Wilson and Penzias noticed that a form of microwave radiation was affecting their readings.
The electromagnetic radiation was everywhere and is now called cosmic microwave background radiation (CMBR).
CMBR is explained as being heat left over from the Big Bang.
As the Universe exploded, it cooled and the radiation was stretched out. Today this radiation is in the microwave region of the electromagnetic spectrum.
IP1.32.3 Evidence for the Big Bang
© Oxford University Press 2011
Unanswered questions
There are still a great number of unanswered questions in physics.
The scientific theories do not explain how or why the Universe began.
Recent observation suggests some very strange events at the edge of the Universe due to it not expanding in the way the Big Bang predicts.
Scientist have tried to come up with theories explaining these observations, including dark matter and dark energy.
