I have a question that I can't figure out. In the Sun, it takes several hundred thousand years for a photon released in the core to reach the surface. Use the speed of light and the radius of the sun to estimate the escape time for a photon from the center of the sun if there were no interaction. The suns radius is 696,000km and light travels at 3 x10c/s.....this is where I get lost. Can anyone help me?