Cosmic Microwave Background Challenge | Space Time | PBS Digital Studios

If a photon leaves the train station shortly after the Big Bang ... Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g Purchase a Space Time t-shirt with money: http://dftba.com/spacetime ______________________ REFRESHER EPISODES: Space Used to Be Orange!! https://www.youtube.com/watch?v=3tCMd1ytvWg Why the Big Bang Definitely Happened https://www.youtube.com/watch?v=aPStj2ZuXug Question #1: What physical distance did the light from the CMB travel through an expanding universe to reach us today? Question #2: What average distance could a photon travel before being scattered by an electron just before recombination? (show your work!) Choose one question to answer. Email answers to pbsspacetime@gmail.com Make sure you title your email: "CMB Challenge" 5 random winners will receive a PBS Space Time Digital Studios t-shirt! Good luck! ______________________ If you would like to attend Matt s gravitational waves seminar on March 14th in NYC, email pbsspacetime@gmail.com with the subject line "NYC Gravitational Waves" for more details! ______________________ Written and hosted by Matt O Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)