In the stratosphere over Siberia, temperatures recently jumped nearly 100 degrees Fahrenheit, shoving the polar vortex off its North Pole perch.

Lightning happens all the time, but certain parts of the world get far less of it than others, including near the North Pole. Lightning requires atmospheric instability, something that’s set up ...

Most people have never seen the Little Dipper, because most of its stars are too dim to be seen through light-polluted skies.

NASA is revealing secrets about this mysterious ice giant that could change our understanding of the outer solar system. From ...