What is the source of stellar energy? Detailed answer

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What is the source of stellar energy? Detailed answer

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What is the source of stellar energy?

According to modern concepts, the main source of stellar energy is thermonuclear fusion reactions occurring in the interior of stars and accompanied by the release of a huge amount of energy. The main role here is played by the transformation of hydrogen (the most common element in the universe) into helium.

This process can go in two ways, the first of which is the sequential attachment of four protons (hydrogen nuclei) to each other and their union in a helium nucleus (proton-proton reaction).

The second way of the thermonuclear fusion process consists in the addition of protons to more complex nuclei, starting from the carbon nucleus, with the subsequent decay of the resulting new complex nucleus into a carbon and helium nucleus (carbon cycle).

The proton-proton reaction is critical at temperatures below 16 million Kelvin; at higher temperatures, the carbon cycle predominates.

With an increase in temperature up to 100 million kelvin, energy can be released during the formation of carbon nuclei directly from helium nuclei (helium reaction).

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Where and when was a day divided into 10 hours, an hour into 100 minutes, and a minute into 100 seconds?

After the accomplishment of the French Revolution in 1793, the National Convention reformed the calendar and time units. The year was divided into 12 months strictly of 30 days each, and the month consisted of 3 decades of 10 days, of which only one day was a day off for civil servants. The remaining 5 or 6 days of the year, the so-called sans-culotides, did not belong to any month. According to the new rules, a day was divided into 10 hours, an hour into 100 minutes, and a minute into 100 seconds, and thus each new second corresponded to 0,864 of the old second. On January 1, 1806, Napoleon abolished this system and returned the calendar familiar to us.

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