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

You know, after decades of pointing optics toward the sky, I consider myself a knowledgeable observer. But while researching the Pleiades a few months back, I was surprised to learn that it wasn't the ...

Light, especially blue-enriched light (which has a higher amount of blue colours in it, like the light at midday), plays an ...

Of course, the sky is not always blue. And Rayleigh scattering also explains why the sky tends to be reddish when the sun is close to the horizon – at sunrise and sunset.

This is likely because we evolved to see the natural bright blue sky during the day, rather than indoor electric lights at night which are much less bright – or blue. As we age, our eyes change ...