A sudden burst of red light flickered above a thunderstorm, and for a brief moment, Earth’s upper atmosphere revealed one of its most elusive secrets.

Most likely, it's a mixture of all three. A hero that was supposed to be funny and easy to root for instead makes all those ...

NASA astronaut Nichole Ayers photographed a rare atmospheric phenomenon over the US and Mexico known as a "sprite" that's ...

“They appear moments after a lightning strike—a sudden reddish flash that can take a range of shapes, often combining diffuse ...