Here are several activities that can be carried out, after reading the book "History of the beginning", to better understand how it came to the big bang theory :
1. how to build a spectroscope
template to build a spectrometer
2. The universe is expanding
3. The removal rate is proportional to the distance
4. Calculation of the Hubble constant
5. There is no center in the expansion
6. Shift toward red
7. Cosmic background radiation
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