Does our Sun have a Solid Surface?

From observing the Sun, it is clear that the so called photosphere is a liquid. It is not a gas, and if it is a plasma, it is a strange and unusual form of plasma, behaving like a liquid.

But is the Sun as a whole a liquid blob of matter?

Christian Birkeland made the prediction more than a hundred years ago that the Sun should have a solid surface beneath the visible layer. He based this on the fact that the Sun has electrical properties reproducible in a laboratory. Using a metal globe, a so called Terrella, he reproduced many of the known features of the Sun.

Since the temperature of the Sun is observed to be lower the closer we get to its surface. It's not unreasonable to imagine this decrease in temperature to continue as we move farther in towards the Sun's center.

If the temperature in the corona can be a million degrees, while the photosphere is a mere six thousand degrees, then a further drop of temperature to about one thousand degrees at some point below the photosphere, seems entirely reasonable. At a thousand degrees, iron and silicon are solids.

This means that stars may very well be solid bodies covered in a relatively thin layer of liquid.

Surface of our sun

By Hinode JAXA/NASA - http://www.nasa.gov/mission_pages/solar-b/solar_017.html, Public Domain, Link