Neil deGrasse Tyson Explains Colliding Galaxies in an Expanding Universe

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If we live in an expanding universe, how can galaxies collide with each other? Watch Neil deGrasse Tyson answer this fan's Cosmic Query, in addition to addressing comic co-host Eugene Mirman's concerns about our Milky Way galaxy's impending collision with the Andromeda Galaxy in about 6-8 billion years. • If you love StarTalk Radio, don't miss out on any StarTalk news. Sign up for our free newsletter: http://www.startalkradio.net/newslett... • Catch up with StarTalk Radio around the web: • iTunes - http://bit.ly/SOHDg6 • SoundCloud -   / startalk   • Stitcher - http://www.stitcher.com/podcast/startalk • Twitter - https://twitter.com/#!/StarTalkRadio • Facebook -   / startalkradio   • Google+ - http://goo.gl/ZP59S • Pinterest -   / startalk   • Tumblr -   / startalkradio   • Instagram -   / startalkradio  

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