Tag Archives: cross-section

The Solar Neutrino Problem

The solar core emits neutrinos as a result of the nuclear reactions in the pp-chain. The thing with neutrinos is, they have a very small cross-section, and therefore are very difficult to detect (they can go all the way through Earth … Continue reading

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Energy Sources and Luminosity

Where does the energy emitted by a star come from? One source is obviously gravitational potential energy U. If r decreases, U decreases too, and can be converted into radiated energy. However, because of the Virial Theorem (E = <U>/2) only 1/2 of … Continue reading

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