Solar energy is the best source of power, because it is free, efficient, and endless. Solar panels are also lightweight, so it is easy to lift into orbit. Batteries are used to store power generated by solar panels. List three ways astronauts get exercise in weightlessness. Stationary bicycles, rowing machines and treadmills 11.
Sponge baths are the best way to bathe in space.
Moisten sponge with built-in water connection Scrub yourself Wash hair with waterless shampoo Dry off 12. Launched in 1973, Skylab's mission was to prove that humans could live and work in space for long periods of time, and to study the sun. Plants, because they naturally convert carbon dioxide into oxygen. It takes ten square meters of plants to recycle just one astronaut's air. List three reasons why this is a good method.