The Photosphere Virtually all of the light we get from the Sun comes from the photosphere, hence the name. The photosphere is only a few hundred kilometers thick. In comparison, that is three times thinner than the skin of an apple. Think about that! All of the sunlight you see comes from that thin skin. The photosphere has a temperature of just below 6,000 Kelvin. The photosphere displays granulation which is evidence of convection currents below the surface. Here is a nice time lapse movie of solar granules. Granules are generally about the size of the state of Texas. They are not unlike the altocumulus clouds that form in our atmosphere; much larger, of course. Granules in the photosphere occasionally grow up to become sunspots.