Who would guess that the Sun was such an active place?  It seems to shine from one day to the next, just as it has always done.  Of course, it is so bright that it would damage our vision if we were to look at it directly, but with modern telescopes and cameras we can see the incandescent gas on its surface whipping and looping with the Sun's strong magnetic field lines.  Making movies of this process captures the drama and wonder of high-energy physics at work.

Imagine how amazed people in Galileo's time would be to see such a thing.  They weren't even aware that the Sun changed at all, and thought it was part of a perfect, static celestial realm.  Only the Earth and the human realm was imperfect and subject to change, according to their understanding of the cosmos.  How far we have come in our understanding of the Universe!