Space weather originates from the Sun. The Sun releases matter into space like solar flares, coronal mass ejections, coronal holes, sunspots and solar prominences.
Sunspots are spots on the surface of the Sun that appear darker because they are cooler than the surrounding area. The largest sunspots observed are about 50,000 km in diameter, which is large enough to be seen with the naked eye. Sunspots usually come in groups of up to 100 sunspots. Groups of 10 sunspots are rare though.
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