Online UFO forums are abuzz with excited speculation about an alleged huge and mysterious "blue sphere" UFO captured on November 17 by cameras on board one of NASA's STEREO (Solar Terrestrial Relations Observatory) satellites. The alleged "blue sphere" UFO was reportedly spotted zooming across the face of the Sun.
Wild conspiracy theory speculation about the nature of the alleged massive blue sphere UFO moving across the face of the Sun was generated partly by the fact that the image was uploaded to NASA's Stereo Science Center website without accompanying explanation of the nature of the phenomenon it documented.
[Note: The image taken on November 17, 2016 may be viewed here on NASA's Stereo Science Center website: select "Ahead HI1" view.]
But another page on the website reveals that the image is an example of a "corrupted image" of the Sun that occurs when, "on rare occasions," the STEREO image processor becomes "overloaded."
The overloading, according to NASA, occurs due to over exposure.