A mysterious spiraling blue light illuminated the night skies over Europe on Monday ... shows the glowing light spinning across the sky in what many social media commentators likened to a spiral ...

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?

Find out what's up in your night sky during April 2025 and how to see it in this Space.com stargazing guide. Looking for a telescope for the next night sky event? We recommend the Celestron ...