Videos posted on X showed a blue orb in the night sky that was visible in the U.K., France and other countries.

“Busted Plug,” the 40-foot fire hydrant statue that for years sat near the intersection of Taylor and Bull streets in ...

Astrophysicist Dr. Paul Sutter spoke with NBC News' Gadi Schwartz on the spectacular atmospheric event that a SpaceX rocket ...

A Curious Blue Swirl of Light Captivates Sky Watchers in Europe 0:27 NOW PLAYING 1:07 0:43 14:22 Two Astronauts on an 8-Day Mission That Turned Into a 9-Month Odyssey 2:05 0:36 2:58 1:03 ...

You might think that explaining why the sky is blue would be kind of simple ... others by my own field of chemistry. The nitrogen and oxygen that you are breathing right now are made up of ...

A blue and white spiral in the night sky is seen from Sweden. (Bertrand Ilhe / AFP via Getty Images) ...