The surface of the sun
This particular website raised my "BS Meter" to a level where I decided to post it here instead of on "Space," but it was cool enough that I wanted to post it somewhere. I haven't gone over it in any detail, but IMO there is a strong flavor of "manipulate the images until you see what you want to."
I have no idea what kind of pressures would be required to maintain these materials as a solid at these temperatures, if at all.