Here's a light propelled vehicle test launch in an open-shutter snapshot. The light is focused into a laser which causes air to explode - each ring of light you see is an explosion which further launched the vehicle upward.



You can learn about all kinds of experimental and theoretical technologies being developed at:

http://www.howstuffworks.com

Recommended link to get at cool info fast:
http://www.howstuffworks.com/category.htm?cat=Compww
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