All 5 Parts of – The Universe – Light Speed http://www.youtube.com/view_play_list…Streaking through space, light is the fastest thing in the universe. As it reaches us across vast distances it reveals the history of the cosmos. Light travels at 186,000 miles per second, its speed is an ultimate barrier, nothing can go faster. But is the answer final? Will spaceships ever speed faster than light? Is it even worth trying? It can neither be touched nor felt. It is an abstract quantity of immense impact. The rate of motion at the very heart of all existence, the fundamental linchpin of the universe that we call light speed.
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