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General Relativity
Consider a spherical blackbody of constant temperature and mass M whose surface lies at
radial coordinater = R. An observer located at the surface of the sphere and a distant observer
both measure the blackbody radiation given off by the sphere.Both observers use the
Stefan-Boltzmann law, to determine the radius of the spherical blackbody. Show that
R
R, =
1 – 2GM/Rc²

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