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BIG SUNSPOT: In less than 48 hours, sunspot 720 has blossomed from an almost invisible speck

into a dark behemoth 5 times wider than Earth.

Solar activity could increase if this rapid growth continues. Already the ‘spot is big enough to see,

but never stare at the sun. Check spaceweather.com for safe solar observing tips.

sunspot

SOLAR WIND: Earth is inside a high-speed solar wind stream that is causing some mild

geomagnetic storms. Sky watchers in e.g. Alaska, Canada and Scandinavia should be alert for

auroras tonight.

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