ASTR-1010 Lecture Notes - Lecture 23: Radiation Zone, Particle Detector, Solar Wind
2 Nov 2017
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Remote sensing: radar/laser altimeter to map the surface elevation. Direct sensing: particle detector, magnetometer, mass spectrometer to determine chemical composition. Directly collects dirt particles from saturn"s environment. Measures amount, species, and direction of dirt particles. 73% hydrogen, 25% helium, 2% metals (carbon, oxygen, nitrogen) 109 earths would fit across the diameter of the sun. Rotation rate at equator = 25 days. Rotation rate at poles = 30 days. Mass = (cid:2779) (cid:2778)(cid:2777)(cid:2780)(cid:2777) kilograms = 300,000 earth"s mass. = 10,000 but we know the sun is older than that. (cid:3040)(cid:3039) (cid:3042)(cid:3041)(cid:3041) (cid:3039)(cid:2931)(cid:2923)i(cid:2924)(cid:2925)(cid:2929)i(cid:2930)y: (cid:3042)(cid:3041)(cid:3039) (cid:3043)(cid:3042)(cid:3041)(cid:3039) (cid:3041) (cid:3039)(cid:2931)(cid:2923)i(cid:2924)(cid:2925)(cid:2929)i(cid:2930)y. = 25 million years but we know that the sun is older. So we know that chemical and gravitational contraction on their own cannot explain how the sun shines, so it must be a combination of both. Today, we know that the sun is a stable source of nuclear fusion.
