A universe with a history
The hot Big Bang model describes an early hot, dense universe that expanded and cooled.
In 30 seconds
- Expansion concerns distances on large cosmic scales.
- It is not simply debris exploding from one point into pre-existing empty space.
- The model does not by itself settle every question about an ultimate beginning.
Make it concrete
Mark dots along a stretchable line. Stretching increases distances between dots. The analogy illustrates separation, not the full geometry of the universe.
- 01Hot & dense
- 02Expansion
- 03Cooling
Check your understanding
Does the Big Bang model require Earth to be at the centre of expansion?
- Expansion concerns distances on large cosmic scales.
- It is not simply debris exploding from one point into pre-existing empty space.
- The model does not by itself settle every question about an ultimate beginning.
Go to the source
Sources reviewed: 13.09.2026