How big is the universe? meltyourmindnz / 8 January 2014 Sal Kahn of the Kahn Academy gets a bit tongue-tied attempting to explain the intergalactic scale of the universe. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)MoreClick to email this to a friend (Opens in new window)Like this:Like Loading...
