A blue sky is a good sky. It's a reassuring sight that promises clear weather and bright days. But what does it mean when the sky turns purple? While it's not uncommon to spot purple skies during ...

SNOWFLAKE, Arizona -- There was a flashback to the 60s in the sky over a town in Arizona last week. The video above shows a strange purple haze across the sky on a foggy day.

Blue purple aurora photographed in Norway. (Image credit: marouan touil via Getty Images) Blue and purple auroras are even less common and also tend to appear during periods of high solar activity.

Why skies are blue instead of purple LiveScience: The sky looks blue because of human physiology as well as atmospheric physics, as explained in a newly published scientific paper. July 19, 2005 ...

As Hurricane Delta pushed farther inland Friday evening, it left behind a stunning sight that's created only when atmospheric conditions are just right. In areas extending from Cypremort Point ...

A similar "Purple Haze" sky was noticed way back in 1991 around the U.S. and Colorado when Mount Pinatubo erupted over the Phillippines and spread volcanic ash and gas around the world. More from ...

Purple clouds rise into a starry night sky in this beautiful image. B.G Boyd captured this photo in early August around 5 a.m. while gazing up at the night sky over Tucson, Arizona to witness the ...

A purple ribbon of light in the sky known as "STEVE" appears to have a long-lost twin. This isn't the plot of a space soap opera; it's a finding from a trio of European Space Agency satellites ...

SNOWFLAKE, Arizona -- There was a flashback to the 60s in the sky over a town in Arizona last week. The video above shows a strange purple haze across the sky on a foggy day.