July 10, 2012
Two prominences erupted out from the Sun with a day of each other (June 17-18, 2012) as seen by NASA's SDO in extreme UV light. These were not major storms, but very photogenic events. Such eruptions occur quite frequently, though they are usually smaller and hard to see unless they are in profile, like these are.
Topics: Volcanology, Plate tectonics, Geology, printing, Types of volcanic eruptions, Io, Volcano, Electromagnetic spectrum, Ultraviolet, National Aeronautics and Space Administration