What is string theory? On this episode, Neil deGrasse Tyson and comic co-host Jordan Klepper answer fan questions about solar system formation, dark matter, and the expansion of spacetime. What would travelling at the speed of light look like?

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Thanks to our Patrons Manuel zamarripa jr, John D, HyperactiveJedi, Graham Hayward, Adam Caplan, Y. Koss, and Kristin S for supporting us this week.

Photo Credit: ESO/IDA/Danish 1.5 m/R.Gendler, J-E. Ovaldsen, C. Thöne, and C. Feron., CC BY 4.0 , via Wikimedia Commons

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