Properties |
Standard Solar Model |
New Solar Model |
Origin |
The sun formed instantly as a homogeneous body from an interstellar cloud with no mass accretion or mass loss. |
The sun formed in a timely manner by accretion of fresh supernova debris on the collapsed core of a supernova. |
Main source of luminosity |
Hydrogen-fusion in the core |
Energy from a supernova core |
Main nuclear reactions |
Hydrogen fusion: 4 1H + 2 e- → 4He + 2 v + 27 MeV |
Neutron emission: 1n → 1n + 10 MeV Neutron decay: 1n → 1H + 0.8 MeV Hydrogen fusion: 4 1H + 2 e- → 4He + 2 v + 27 MeV |
Energy from hydrogen fusion |
˜ 100 % |
˜ 38 % |
Solar neutrino flux, excluding CNO neutrinos* (observed/predicted) |
˜ 50 % |
˜ 130 % |
Observable by-products of nuclear reactions |
1. Neutrinos from the decay of fusion products in the core. |
1. Neutrinos from the decay of fusion products in the core.
2. Hydrogen ions escape from the surface in the solar wind. |
Major elements in the sun |
Hydrogen, helium, carbon |
Iron, nickel, oxygen, silicon |
Comparable meteorites |
None. Only about 0.1 % of the sun has the composition of carbonaceous chondrites. |
About 99% of the sun has the same composition as ordinary meteorites. |
Comparable planets |
Giant planets far from the sun |
Rocky planets close to the sun |