Photos show the lights illuminating the sky in vivid color across the U.S. this week. They'll be visible again in some states on Thursday.

Nature offers many dazzling displays, from jagged flashes of lightning to radiant sunsets. But perhaps one of the most elusive natural phenomena is the shimmering waves of green, pink, and red dancing across the night sky,

On Tuesday, NOAA issued a G4, or severe, geomagnetic storm watch in response to recent coronal mass ejections, or CMEs, from the sun. CMEs are huge bubbles of coronal plasma that the sun occasionally ejects, NASA says. The highest geomagnetic storm level is G5, which is considered extreme.

Strong geomagnetic storms and a moderate solar radiation storm have led to an aurora view forecast for Wednesday night in the northern U.S.

The northern lights were visible Tuesday night across the Chicago area, illuminating the sky with brightly colorful displays due to severe solar storms.

After displays of auroras lit up the sky on Tuesday, another Northern Light array is expected to bring a gleaming light show to the northern part of the U.S. Wednesday.

Many missed this week’s aurora due to clouds, light pollution or a simple lack of patience. Here’s how to prepare better.

The northern lights occur as a consequence of solar activity and result from collisions of charged particles in the solar wind colliding with molecules in the Earth's upper atmosphere. The best conditions to view the lights are when the sky is dark and clear of any clouds.

Bands of green and red first pierced through the hazy night sky around 9:30 p.m. above the pier at Grand Haven State Park.