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What is the very first step in the sequence of processes by which a main sequence...

What is the very first step in the sequence of processes by which a main sequence star like our Sun derives its energy output, and about how long does it take for this first step to occur with 50% probability?

1. Weak decay of a proton to a neutron, positron and neutrino, in about 5 ×109 years.

2. Fusion of two He4 nuclei to form C8, in about 1 year.

3. Fusion of deuterium and tritium, in about 2 seconds.

4. Fusion of a proton and neutron to form H2, in about 0.01 second.

5. Fusion of a proton with He4 in about 0.1 second.

6. Fission of a He4 nucleus into two H2 nu- clei.

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genius_generous answered 2 years ago
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