Astronaut and International Space Station Science Officer Don Pettit shot this beautiful time lapse of the Earth rotating through the day and night cycle.

It's pretty amazing how bright our cities are at night. Pettit's video also shows to great effect just how relatively thin our atmosphere is. It's easy to think it is without end while staring up at the sky from a grassy field, but when you really get up there and see it from this angle, you realize how little space we have to work with. If we screw it up, there's nowhere else to go.

Pettit has a collection of awesome videos showing things like how CD players act as gyroscopes in zero gravity and what the aurora borealis looks like from space.

Shea Gunther is a podcaster, writer, and entrepreneur living in Portland, Maine. He hosts the popular podcast "Marijuana Today Daily" and was a founder of Renewable Choice Energy, the country's leading provider of wind credits and Green Options. He plays a lot of ultimate frisbee and loves bad jokes.

Watch: Astronaut films time-lapse of Earth's rotation
Check out this amazing video showing the earth as it rotates from night to day and back to night again.