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Fuel cells? Good
guess. Fuel cells, however, are more commonly used for human spaceflight.
Fuel
cells use chemical reactions to transform hydrogen and oxygen into electrical
power, water and heat. Because they produce water and heat as well as power,
NASA has used them for more than thirty years in its human spaceflight program,
in spacecraft from Gemini to the Space Shuttle.
Fuel
cells are becoming cheaper to produce, so they may start appearing in buses
and cars in the future! But they don't power STARDUST. Try
again!
 Solar panels |
 Nuclear power |
| Fuel
cell image and animation courtesy Schatz Energy Research Center, Humboldt
State University, California. NEBUS image courtesy of Ballard Power Systems. Spacecraft images copyright 1996-97, California Institute of Technology. All rights reserved. Further reproduction prohibited. |