Watch This When You're High - Why Is The Sky Blue?

The sky is blue, but have you ever wondered why? And is it actually blue? Or is that just how it appears to the human eye?

Neil deGrasse Tyson is here to help you answer that question alongside comic co-host Chuck Nice.

The answer is easy to understand, but not that simple. In this video you’ll learn how the white light from the sun interacts with the atmosphere through a process called “Rayleigh scattering” that makes the sky blue. Neil tells us why the sky turns different shades as the day goes on, and why the sunset changes from blue to amber. Discover why the reason we have a blue sky is the same reason you can’t see stars during the daytime. And, how this lead to the discovery of the operational definition of where the atmosphere ends and space begins. Neil explains why he thinks space should be defined by gravity and not by the circumstances of our atmosphere. Lastly, Neil gives us a lesson on the frailty of our atmosphere and our delicate place among the stars.

Here's more info on "Rayleigh Scattering"

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