Sunspots HMI SDO

Image from the Solar Dynamics Observatory mission of the solar disk with multiple sunspots, which appear dark compared with their surroundings. Credit: HMI/SDO/NASA
Image from the Solar Dynamics Observatory mission of the solar disk with multiple sunspots, which appear dark compared with their surroundings.
HMI/SDO/NASA
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Attribution-ShareAlike (CC BY-SA 4.0)