Since the beginning of the American space program, the X-planes have been the test models for space technology. Currently there are several experimental X-plane models in development that could make space travel as routine as airplane travel. These lightweight vehicles are designed to lower launch costs, and could eventually replace the space shuttle, which has been in use since 1981. In this edition of How Stuff Will Work , you'll find out about some of the space planes being developed by NASA, and how these spacecraft might one day succeed the space shuttle and be used as commercial vehicles for space tourism. Inc. All rights reserved.
Meteors burn up when they hit the earth's atmosphere.
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