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We normally rely on physics to interpret and understand astrophysical processes. However, with precise seismic data from the Sun and other stars, we can use astrophysics to inform us about the physical properties of stellar matter, and in some cases inform us even about fundamental physics.
In this talk I shall describe how we use seismic data has been used to study properties of matter. I shall also touch up how solar and stellar data have been used to put constrains on fundamental physics, such as the time variation of the gravitational constant.
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