Weight of
upper layers compresses lower layers.
Gravitational
equilibrium
Gravity pulling in balances pressure
pushing out.
Energy balance
Thermal energy released by fusion in
core balances radioactive energy lost from surface.
Gravitational
contraction
Provided energy that heated the core
as the sun was forming.
Contraction stopped when fusion
started replacing the energy radiated into space.
Radius: 6.9 x
10^8. 109 times earth
Mass: 2 x 10^30kg.
300,000 earths
Luminosity:
3.8 x 10^26 watts
Solar wind
A flow of charged particles from the
surface of the suns.
Corona
Outermost layer of solar atmosphere.
Chromosphere
Middle layer of solar atmosphere.
Photosphere
Visible surface of the sun.
Convection zone
Energy transported upward by rising
hot gas.
Core
Energy generated by nuclear fusion
Fission
Big nucleus splits into smalls
pieces
Fusion
Two pieces stick together
The sun
releases energy by fusing four hydrogen nuclei into one helium nucleus.
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