In today's episode, Phil looks at how gravity plays out across the universe. This episode is sponsored by Squarespace: www.squarespace.com/crashcourse -- Gravity is a Force 2:17 Different Types of Orbit 3:41 Escape Velocity 5:30 Weightless Mass 7:03 -- PBS Digital Studios: youtube.com/pbsdigitalstudios Follow Phil on Twitter: twitter.com/badastronomer Want to find Crash Course elsewhere on the internet? Facebook - www.facebook.com/YouTubeCrashCourse Twitter - www.twitter.com/TheCrashCourse Tumblr - thecrashcourse.tumblr.com Support CrashCourse on Patreon: www.patreon.com/crashcourse -- PHOTO/VIDEO CREDITS First photo by Roscosmos / NTSOMZ/ SRC "Planeta" / zelenyikot.livejournal.com www.slate.com/blogs/bad_astronomy/2013/09/25/earth_at_equinox_elektro_l_view_of_the_earth_from_space.html commons.wikimedia.org/wiki/File:Portrait_of_Robert_Hooke_with_a_book,_spring_and_quill.JPG en.wikipedia.org/wiki/Isaac_Newton#mediaviewer/File:GodfreyKneller-IsaacNewton-1689.jpg en.wikipedia.org/wiki/Johannes_Kepler#mediaviewer/File:Johannes_Kepler_1610.jpg en.wikipedia.org/wiki/Karen_L._Nyberg#mediaviewer/File:Karen_Nyberg_STS124_-_2008June07_(NASA_S124-e007134).jpg www.youtube.com/watch?v=doN4t5NKW-k

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