On Monday night, skywatchers were treated to a moderate display of the northern lights. For those who missed out, there's still a chance they may be visible again tonight, with a stronger geomagnetic storm forecast.

The U.S. National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center (SWPC) is forecasting a strong geomagnetic storm. (Monday's was considered moderate.)

The sun has been quite active, with many sunspots on its surface. Sometimes, those spots unleash a solar flare. These large eruptions of electromagnetic radiation can last minutes to hours, and can disrupt some radio transmissions on Earth.

Quite often, these flares are followed by a coronal mass ejection (CME), a large expulsion of particles from the sun that travel faster than normal on t

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