Arcs rise above an active region on the surface of the Sun in this series of images taken by the STEREO (Behind) spacecraft. Credit: Images courtesy of the NASA STEREO Science Center.
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Sun is a lecture and an article about an entity, source, and/or object observed on or near the surface of the Sun with radiation astronomy.
You are free to take this quiz based on the Sun. Once you've read and studied it, the links contained within, and listed under See also, you should have adequate background. Enjoy!