It is important to remember that the sun is the source of all geothermal energy. NASA has some spectacular videos that give you a feel for the power of our sun! Try this video on for size (careful, it can be mesmerising). According to the leader on the video, this 15 minute video required about 150 hours of special technicians’ time to prepare. It is made from ten different wavelength exposures, each shown in different colours here, taken every 10 seconds.
P.S. If you get a white box with or without advertising in the middle of the screen, you can cancel it, Mouse-over the upper right corner area – when you see a small black circle with an “x” in it, click on it. That should close all the garbage and give you an unrestricted view. It is even more spectacular full screen!