Batteries are essential aboard your space station—but not as the main power source. Batteries are very bulky and heavy, and your energy needs would soon drain them. It would cost too much to bring enough into space for all your power needs.

But batteries are perfect for storing energy produced in another way. What's the best way to produce this energy?

Fuel cells (One kilogram of fuel cells produces .70 kilowatts)

Nuclear (One kilogram of fuel cells produces .03 kilowatts)

Solar energy (One kilogram of solar cells produces .10 kilowatts)

© The Children's Museum of Indianapolis, 1999