Why is the Earth Round and the Milky Way Flat? | Space Time | PBS Digital Studios

Let PBS know what type of digital series you'd like to see by taking this survey: Why does our universe make spheres and disks? Get your own Space Time t-shirt at Tweet at us! @pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: Our universe is not a very diverse place when it comes to shapes. Large celestial bodies become spheres, galaxies become discs, and there is little room for variation. Why is this? Well it turns out physics has some pretty strict rules when it comes to creating new planetary bodies. On this week's Space Time, we explore equillibrium and symmetry, the two defining factors that shape our universe. _____________________ COMMENTS: Felix Ironfist Florent POUJOL Reuben Silva Dom Vasta ______________________ Written and hosted by Matt O'Dowd Made by Kornhaber Brown (www.kornhaberbrown.com)