1 to October 3, 2010 took place in Santiago de Compostela the XI edition of "Science in Action." Chapter of "physical demonstration" of the events which were shown above in videos:
1. How to build a spectroscope.
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. Redshift.
7. Cosmic background radiation.
In Retamar web. 
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