metal / chemical rockets / crude metal / metal blades / efficiency collecting electric energy / early metal-workers / chemical propellants / gas increases / space technology / space technologies / metal fuses / pit mining / industrial manufacturing / transportation costs / vigorous chemical reaction / mining / Solar energy / fewer support systems / hot gas / fuel oil / energy / steel / surface mining / /
Organization
African Union / Asteroids Juliana Kew Massachusetts Academy of Math and Science Abstract Experiments / National Aeronautics and Space Administration / Consumer Product Safety Commission / / /
Position
hexagonal head / separate collector / head / Craftsman / /