Big Bang Revision notes

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Red Shift
Measurements of red ­shift suggest that all the galaxies are moving away from us very
More distant galaxies have greater redshifts than nearer ones this means they're moving
away faster than nearer ones.
This provides evidence that the whole universe is expanding.
Theory 1: Big Bang
All the matter and energy in the universe was compressed into a small space then it
exploded and started expanding.
We can use the current rate of expansion of the universe to estimate its age (about 14
billion years.)
Theory 2: Steady State Solution
Universe has always existed as it is now and always will do. The expansion is because
matter is created in spaces as the universe expands.
The CMBR (Cosmic Microwave Background Radiation) was strong evidence for the Big Bang.
Scientists detected low frequency electromagnetic radiation from all parts of the universe.
The radiation is largely in the microwave part of the Electric Magnetic spectrum (CMBR)
Just after the Big Bang while the universe was still extremely hot everything in the
universe emitted very high frequency radiation. As the universe expanded it cooled, and
this has dropped frequency and is now seen as microwave radiation.
Big Bang Limitations
Many astronomers agree with this theory, although others don't (maybe because they
don't want to admit they're wrong.)
The theory believes the expansion should be slowing down but it's actually speeding up.
Doesn't explain what caused it, or if there was a before, what the conditions were like.
It explains so much that it may be hard for scientists to drop the theory.


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