Thank you for The Great Courses Plus for supporting PBS. To learn more click https://ift.tt/2Itjvhj We’re on PATREON now! Join the community ►► https://ift.tt/2LvgZrN ↓↓↓ More info and sources below ↓↓↓ SUBSCRIBE so you don’t miss a video! ►► http://bit.ly/iotbs_sub If the sun instantly switched off like a light bulb–which can’t happen, by the way–then we wouldn’t know for almost 8 and a half minutes. Light travels at the fastest speed there is, but it still takes almost 500 seconds to get to Earth. That’s how long it would take before we knew the sun went dark.But the most amazing thing about the sunlight we see is it’s actually really old. SUPER old. AMAZINGLY OLD! Tens of thousands of years old. How is that possible? Because of the physics and mathematics of random walks. References: https://ift.tt/2TkaZqX Special thanks to our Brain Trust Patrons: AlecZero Bob Rosset Brent M. Diego Lombeida George Gladding Ron Kakar vincbis ----------- Join us on Patreon! https://ift.tt/2nHgsKY Twitter http://www.twitter.com/DrJoeHanson http://www.twitter.com/okaytobesmart Instagram https://ift.tt/2Og06lJ https://ift.tt/2Hwu5Wc Merch https://ift.tt/2kHLiNf Facebook https://ift.tt/2YKQHHi
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