Cosmic Microwave Background
Contents
Key Stage 4
This image shows the temperature variations of the early universe. The different colours represent around 10-4K temperature variation.
Meaning
The cosmic microwave background (CMB) is the radiation left over from the big bang which comes from all directions in space.
About The Cosmic Microwave Background
- The CMB shows that at some point in the past all the matter in the Universe was at roughly the same temperature everywhere. This shows that the Universe must have once been very small.
References
Edexcel
- Cosmic microwave background (CMB) radiation, page 127, GCSE Physics, Pearson Edexcel
- Cosmic microwave background radiation, pages 192, 193, GCSE Physics, CGP, Edexcel