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11/15/99. Norm Herr (sample file). SUN. 75% hydrogen and 25% helium by massSun converts hydrogen to helium in its coreDifferential rotationequator the surface rotates once every 25.4 daysnear the poles it's as much as 36 daysCore conditionstemperature is 15.6 million Kelvinpressure is 250 billion atmospheres.
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