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Last Post 18 Oct 2010 12:28 PM by  Emilia Kilpua
Sun´s temperature
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18 Oct 2010 08:52 AM

    My students would like to know how scientists can measure the temperature in the inner core of the Sun.

    Tags: temperature


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    18 Oct 2010 12:28 PM

    This is a very good question! And tricky since we cannot measure the temperature in the solar core from the solar spectrum like the surface temperature. However, we can get a simple approximation from the fact that the Sun is in equilibrium: the inward pressure by the gravity has to be balanced by the outward pressure from the solar energy output. Since we know the solar radius and the mass we can estimate the core temperature that is needed to hold the Sun up against gravity.

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