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?NOTE: StarTalk+ Patrons can watch or listen to this entire episode commercial-free here: https://www.startalkradio.net/show/cosmic-queries-smarty-pants-trash-bin-with-jordan-klepper/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