Skywatchers are anticipating a possible aurora borealis for parts of the US on Dec. 25 following a solar flare that spewed a coronal mass ejection (CME) toward Earth. The CME prompted a geomagnetic storm warning from the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center on Monday.

Millions of people across 10 U.S. states could see the sky lit up by the northern lights on Christmas day, according to the National Oceanic and Atmospheric Administration's (NOAA) forecast. The agency reported that a minor geomagnetic storm is expected on December 25 and 26 due to the arrival of a coronal mass ejection (CME),