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Not an explosion that took place somewhere in space.
Expansion of universe itself.
- time span, t= 0.0001 sec.
- temperature T= 1012 K (trillion C)
1. - Huge density of matter
- crowded together
- extremely hot matter
- elementary particles collide, form new types of particles.
2. Cooled down, water vapor condensed to water droplets, expand into open air.
3. Temperature dropped- Trillion- Billion- Million degrees.
4. ½ hour, mixture of particles combine, not enough particles to collide into each other to form new particles.