Potential polar ring galaxy NGC 4632. The picture shows a gaseous ring perpendicularly circulating the main spiral disk of the galaxy. [Credit: Jayanne English (U. Manitoba), Nathan Deg (Queen's U.) ...

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward into the United States this weekend into next week. Polar air ...

This blast of cold weather is due to activity of the polar vortex.

A lobe of the polar vortex will arrive in the United States this weekend, bringing the lowest temperatures in years and snow and ice to the East and Deep South.

Taking a quick dip in some cold water is nothing new; some people do it to feel invigorated, others for health reasons or to ring in the new ... to take a polar bear plunge. You might think ...