Massive sunspot AR3664: A gigantic sunspot, AR3664, on the surface of the sun ballooned and grew so massive that it can fit 15 Earths and has become the most active one in the current solar cycle.

Gigantic sunspot, wide enough to fill 15 worlds, hits Earth with powerful X-class solar flare

The Sun threw a spell in our way, brighter than a shimmering ghost and quicker than the flick of a black cat's tail, just in time for Halloween. According to NASA, a large solar flare emerged from the Sun on October 28, sparking a "strong geomagnetic storm watch.

Watch: Active October Sun emits a powerful X-class solar flare

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Gigantic sunspot, wide enough to fill 15 worlds, hits Earth with powerful X-class solar flare

Watch: Active October Sun emits a powerful X-class solar flare