Planet sized UFO near sun

This image went worldwide when a youtube video seemed to show an alien ship re-fuel and then shoot away from the sun. UFO skeptics claim that it is actually a Solar Prominence and that they happen rarely, but this does not explain why NASA turned all there cameras off shortly after the youtube video was posted.

Whatever this thing is, it makes for some amazing pictures. So what do you think it is? solar pprominence? or a massive alien ship?