Physics A-Level
Big Bang theory
What Big Bang theory means in Physics A-Level, as defined for OCR.
Definition of Big Bang theory
Check what you remember
Read the wording for your board, then hide it and explain Big Bang theory in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
The universe began from an extremely hot, dense state about 1.4 × 10¹⁰ years ago and has been expanding and cooling ever since.
Topics that use Big Bang theory
- Cosmology (OCR A-Level)
Related terms
- Age of the universe
- Astronomical distance units
- Baseline
- Big Bang nucleosynthesis
- Cosmic microwave background
- Cosmic microwave background radiation
- Cosmological redshift
- Dark matter and its gravitational evidence
Using Big Bang theory in the exam
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