Colossal 'Martian sunspot' is so big it was seen from Mars.

A group of sunspots measuring more than 15 times the diameter of Earth was imaged by NASA's Perseverance Rover last week; now, the spots are pointed toward Earth, with strong flares possible.

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Belgium , , Atmospheric Administration , National Oceanic , World Data Center , Space Weather Prediction Center , Perseverance Rover , Sunspot Index , Long Term Solar Observations , Royal Observatory , Heliophysics Systems Observatory ,