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This SDO/AIA image from Nov. 22, 2014, shows the moon's disk partially blocking its view of the solar corona. AIA's image quality allows you to spot lunar mountains along the shadow's edge.
SDO orbits Earth in such a way that its view of the sun is almost always unobstructed. But a few times a year, the moon gets in the way. This AIA image from Nov. 22, 2014, shows the moon’s disk partially blocking our view of the solar corona. If you look carefully, you can see that the edge of the moon is not a perfect circle: AIA’s image quality allows you to spot lunar mountains along the edge.
Credit: NASA/SDO