Why is the sky blue? The reality explained – as well as whether it’s the same for other planets


EVER looked up on a clear day and thought to yourself, “why is the sky blue?” Why not green or hot pink?

The answer is simple(ish) science, but it may not be quite what you’d expect.

Why is the sky blue?

The sky appears to be blue due to the way that light interacts with Earth.

As sunlight strikes gas particles in the atmosphere, the light separates into all the colours of the rainbow.

This effect is known as Rayleigh scattering, which is named after the man who discovered it, Lord Rayleigh.

Light travels as waves of energy, which are scattered all over the place when the sunlight…



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