That's not a smudge on your screen. It's an image of the moon casting a shadow on Earth. - USA TODAY

NASA this week released a photo of the moon casting a shadow over Earth during a solar eclipse on June 10. .

A solar eclipse "occurs when the Moon is positioned between the Sun and Earth, leading the Moon’s shadow to be projected onto Earth’s surface," NASA said in the release. 

“Taking images of the sunlit half of Earth from a distance four times further than the Moon’s orbit never ceases to provide surprises, like occasionally the Moon getting in our field of view, or the Moon casting shadow on Earth,” Adam Szabo, the NASA Project Scientist of DSCOVR, said Wednesday.