Boron is the fifth lightest element, has a high intrinsic energy density, and is cheap, abundant and stable — making it of interest as a solid rocket fuel and as an additive to jet fuels to ...

There was a problem though; solid rocket motors are far too common to be interesting, and even hybrid rocket engines are becoming passé. We’ve never seen a liquid-fuel rocket build before ...

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 ...