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Powerful Sun Flare
t hit Earth a day later. Shock waves in the CME accelerated heavy ions to near-light speed, and these ions coursed around the Earth and Moon for more than a day. This is called a "radiation storm." If astronauts had been on the Moon at the time, they may have been forced to stay indoors—inside their spaceships or habitats—to avoid exposure. (Hinode Solar Optical Telescope (SOT))