Stargazers in parts of Europe were stunned by an unusual sight on Monday evening: a large, glowing blue spiral in the sky.

This GOES-W repeating satellite time-lapse video provided by the National Weather Service in Portland, captured between 8 a.m ...

This satellite picture shows the Cirrus Radiatus clouds and the blue arrows show direction of jet stream A fan of pink and yellow streaks decorate the blue sky over a frosty field in Coulsdon ...

Sunday turns much colder, with highs in the low to mid-30s. After a few morning clouds, nearly total blue sky is expected in ...

A stunning blue and white spiral spotted in skies across Europe late Monday was created by frozen fuel tumbling from a SpaceX ...

As a cloud comes out from behind the dark clouds into a bright blue sky, it is edged with a silvery lining. Thus we are moving from relative darkness into bright light and the meaning of the idiom ...