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

If the sky is blue during the day, why does it turn brilliant shades of red and orange at sunrise and sunset? The answer lies in the angle of the Sun and the distance its light travels through the ...

This image features a deep field view of the Cassiopeia constellation immersed in the glow of ionized hydrogen gas, where the ...

You might think that explaining why the sky is blue would be kind of simple. But even a brief explanation of it requires a lot of science. The colors of everything you see are produced in ...

It was around 1870 when the British physicist John William Strutt, better known as Lord Rayleigh, first found an explanation for why the sky is blue: blue light from the sun is scattered the most ...

Another Blue Ghost photo of the lunar sunset on March 16, 2025. This one also features Earth (the relatively large, bright object higher in the lunar sky) and Venus (the dot between Earth and the sun) ...

Sunset tonight will feature mostly clear skies with only a few fair weather clouds. No more than about 20% of the sky will ...