To study the sun, scientists use a specialized telescope called a coronagraph. This instrument mimics a solar eclipse by using a occulting disk to block out the sun's bright light. By doing this, astronomers can study the fainter solar atmosphere, the sun's corona, that's hard to see when viewing the entire sun.
However, recently, a coronagraph used by the National Oceanic and Atmospheric Administration (NOAA) caught something extra in their images: the moon.
