The Big Bang
Physics: Edexcel IGCSE, topic 8.3.1
The Big Bang
The Big Bang theory says that the universe began from a single point.
The Big Bang
- The universe began from a very small region that was hot and dense.
- This region ‘exploded’ and started expanding.
- This expansion is still happening.
Evidence
- There are many forms of evidence to support the Big Bang model of the universe.
- An example is the observation of red-shift in distant galaxies.
- Another example is the discovery of cosmic microwave background (CMB) radiation.
Test yourself on The Big Bang
Which of these describe the universe at the time of the Big Bang?