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In today's episode, Phil looks at how gravity plays out across the universe.This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse--Gravity is a Force 2:17Different Types of Orbit 3:41Escape Velocity 5:30Weightless Mass 7:03--PBS Digital Studios: http://youtube.com/pbsdigitalstudiosFollow Phil on Twitter: https://twitter.com/badastronomerWant to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashC...Twitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Subbable: http://subbable.com/crashcourse--PHOTO/VIDEO CREDITSFirst photo by Roscosmos / NTSOMZ/ SRC "Planeta" / zelenyikot.livejournal.comhttp://www.slate.com/blogs/bad_astron...http://commons.wikimedia.org/wiki/Fil...http://en.wikipedia.org/wiki/Isaac_Ne...http://en.wikipedia.org/wiki/Johannes...http://en.wikipedia.org/wiki/Karen_L....https://www.youtube.com/watch?v=doN4t...