This is a composite image of white light photography through a normal tele lens and a shot of the sun through a hydrogen alpha telescope. The size of the hydrogen alpha Sun is scaled to match the size that was seen through the tele lens.
Just imagine how it would be like to see a sunset like this.
Shot taken in May 2013 on the island of Frösön close to the city of Östersund, Sweden. The church in the foreground is Rödö kyrka.