Want to ask some sort of crazy question about Space?: 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! null Let us know what topics you want to learn more about: http://bit.ly/spacetimepoll General Relativity! Spacetime! And... Curved Lines? On this week's episode of Spacetime, Gabe talks about what it actually means for a line to be straight so we can better understand what we mean by the idea of "curved Spacetime". This is Part One of our series on General relativity, so be sure to check it out! Links to Annotated Previous PBS Space Time Episodes: "Is Gravity an Illusion?" https://www.youtube.com/watch?v=NblR01hHK6U "Are Space and Time an Illusion?" https://www.youtube.com/watch?v=YycAzdtUIko Extra Credit: Visualizing parallel transport and geodesics on a sphere: http://www.applet-magic.com/paralleltransport.htm http://www.smith.edu/physics/felder/curvedland/tutlines.html More mathematical PDF about parallel transport and curvature: http://www.physics.ucc.ie/apeer/PY4112/Curvature.pdf ---------------------------------------­­­­­­­­­­­­­­­--------------------------­-­-­-­-­ Comments: Jordan Filipovski https://www.youtube.com/watch?v=bT3hBK6kAJQ MaybeFactor https://www.youtube.com/watch?v=bT3hBK6kAJQ scharfy https://www.youtube.com/watch?v=bT3hBK6kAJQ ourpensareourlips https://www.youtube.com/watch?v=bT3hBK6kAJQ JakeFace0 https://www.youtube.com/watch?v=bT3hBK6kAJQ QuannanHade https://www.youtube.com/watch?v=bT3hBK6kAJQ Ali Muzaffar https://www.youtube.com/watch?v=bT3hBK6kAJQ Marko Nara https://www.youtube.com/watch?v=bT3hBK6kAJQ Indigo https://www.youtube.com/watch?v=bT3hBK6kAJQ Jose Catlett https://www.youtube.com/watch?v=bT3hBK6kAJQ Music: u dont know im fadin Secret Society - Logical Disorder (http://logicaldisorder.bandcamp.com/) Movement 3 - Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto) Philly D Jr - Patternbased (https://soundcloud.com/patternbased) Earth Breath - Human Terminal (http://freemusicarchive.org/music/Hum...) Deep Blue - Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto) Saw Slicing - Patternbased (https://soundcloud.com/patternbased) Heisse Luft - Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com) miracle - slow (http://www.restingbell.net/releases/r) Tropico de Tauro - Sr. Aye https://soundcloud.com/sr-aye) New SpaceTime episodes every Wednesday! Hosted by Gabe Perez-Giz Made by Kornhaber Brown (www.kornhaberbrown.com)