A stunning blue light likely caused by SpaceX Falcon 9 rocket fuel illuminated the night skies over Europe on Monday.

A SpaceX rocket launch from Florida on Monday afternoon produced a dazzling display in the night sky above Europe, leading to some people asking Elon Musk what they were witnessing. The rocket ...

The difference between how light behaves on Earth and how it travels in the emptiness of space, explains the beautiful blue skies and the vast darkness of space. Why is the sky blue in colour?