Cosmic Microwave Background Challenge | Space Time | PBS Digital Studios

If a photon leaves the train station shortly after the Big Bang ...

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REFRESHER EPISODES:

Space Used to Be Orange!!
   • Cosmic Microwave Background Explained  

Why the Big Bang Definitely Happened
   • Why the Big Bang Definitely Happened ...  

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 [email protected]

Make sure you title your email: "CMB Challenge"

5 random winners will receive a PBS Space Time Digital Studios t-shirt!

Good luck!
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If you would like to attend Matt's gravitational waves seminar on March 14th in NYC, email [email protected] with the subject line "NYC Gravitational Waves" for more details!
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Written and hosted by Matt O'Dowd
Made by Kornhaber Brown (www.kornhaberbrown.com)