When the idea of an engine hacks theme was being kicked around at Hack a Day, the subject of rocket engines was one of the first to come up. There was a problem though; solid rocket motors are far ...

For nearly a year, SpaceX has been trying out something new: super-cooling the liquid oxygen (LOX) which is a key ingredient in rocket fuel. It's called deep-cryo LOX, and the idea has been around ...

Solid-fuel rockets are cheaper than their liquid-fuel counterparts, meaning the new engine could significantly reduce spaceflight costs.

This story has been changed to clarify that it is the world's largest single-segment solid rocket. China says it fired up the world’s largest single-segment solid-fuel rocket engine for the ...