A mysterious spiraling blue light illuminated the night skies over Europe on Monday.The cosmic whirlpool was captured in ...

The appearance of an extraordinary spiral of blue light in the sky above New Zealand has prompted amazement among stargazers - and theories ranging from aliens to black holes. Astronomer Alasdair ...

Complicated physics makes these molecules scatter more blue light than red ... far removed from humanity’s wasted sky-directed light, that background can be as dim as 22 mag/arcsec 2.

when we see a blue sky on a sunny day, what are we seeing? Are we seeing blue nitrogen or blue oxygen? The simple answer is no. Instead the blue light we see is scattered sunlight. The Sun ...