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Published on Jul 7, 2011
NASA's Solar Dynamics Observatory caught a comet passing directly in front of the Sun, the first time this has ever been seen. This is not a perspective effect: the comet really is just above the Sun's surface, and presumably evaporated shortly after these images were taken.
I recommend watching it at 720p (HD) at least.
This happened on July 5/6 2011. The detector sees in the extreme ultraviolet, well outside the human eye's range.