The Shape of Galaxies | How the Universe Works

submitted by pkamweru on 09/05/15 1

Why are galaxies spiral shaped? The answer...gravity is needed to shape each galaxy into the structures we know of today. | For more How the Universe Works, visit science.discovery.com/tv-shows/how-the-universe-works/#mkcpgn=ytsci1 Subscribe to Science Channel! | www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. | bit.ly/SCI2YT Download the TestTube app! | testu.be/1ndmmMq

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