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NASA | Hubble & Galaxy Evolution

Three astronomers explain how Hubble acts like a time machine by detecting which galaxies are moving toward and away from us. This video is public domain and can be downloaded at: ?http://svs.gsfc.nasa.gov/goto?10619 Like our videos? Subscribe to NASA's Goddard Shorts HD podcast: ?http://svs.gsfc.nasa.gov/vis/iTunes/f0004_index.html? Or find NASA Goddard Space Flight Center on facebook: ?http://www.facebook.com/NASA.GSFC? Or find us on Twitter: ?http://twitter.com/NASAGoddard?
Length: 03:39

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