AST101H1 Lecture Notes - Lecture 9: Solar Maximum, Solar Minimum, Photosphere
6 Oct 2018
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Ast 101 lecture 8 the sun: the nearest star! Basic properties of the sun: the sun has a diameter of 1,392, 000 kilometers (that is 109 times the diameter of the. Earth: the mass of the sun: 1. 989 x 10^30 kg. The core: 25% of the radius, 50% of the mass, 15 million c, nuclear reactions occurring here. Radiative zone: 49% of the mass, temperature. Lots of churning, the hot gas is always rising to the surface and the cooler gas goes back down. Surface of the sun: where the sun changes from transparent to opaque. The corona: crown , temperature 1,000,000 c, you can only see it during a total eclipse of the sun. Need oxygen to burn, but there is no oxygen in space. Squeezing gas to make it hot, so squeezing the sun would make it shine: the sun has been around longer, the sun would need to be shrinking by 25 meters/year.
