Talk:Water

Other substances, such as aluminum or magnesium and oxygen can be used for rocket fuel. We have plenty of those.

Oxygen has been used for decades as rocket oxidiser. Although magnesium and aluminium are good fuels, and are used in solid rockets, they can not be used in a liquid rocket, as they have to be kept very hot to be a liquid, leading to compatibility issues with supercold LOX. An alternative would be to have a hybrid rocket: a tank of LOX, and a tube filled with metal powder. However, the metal powder will fall out the nozzle. This is why solid rockets use a binder to keep the fuels together. The binder will have to be shipped from Earth. T.Neo 08:42, 11 August 2008 (UTC)