The Moon Passing in Front of the Sun
This sight cannot be seen from Earth. It was visible only from the STEREO-B spacecraft following behind the Earth. Because the spacecraft was farther from the Moon than we are on Earth, the Moon appeared smaller than what we’re used to seeing.
Ultraviolet exposure, STEREO-B, February 25, 2007
Credit: NASA STEREO project; Michael Benson, Kinetikon Pictures