Could spacecraft powered by a new wax be safer and cheaper? .
. The idea of using wax as rocket fuel isn't new. People tried it years ago but couldn't get the wax to work well enough to launch a heavy rocket into space.
The engineers now bracing against the roar of their wax-filled engines suspect, however, that their predecessors
were indeed onto something. If that's true, paraffin wax could become the world's cheapest, safest, most environmentally friendly rocket fuel.