multistage rocket

The two missile-engine tests at Sohae — a facility that Kim had pledged to dismantle — sparked speculation that North Korea is preparing to unveil a more powerful multistage rocket to launch satellites into space.

The Soyuz is a multistage rocket, meaning it uses groups of engines that fire one after another to push the vehicle out of the grip of Earth’s gravity.

“His brilliant concept was the multistage rocket propelled by liquid fuel.”

The plan, which he calls a daisy drive, separates the components of any gene drive into discrete parts—a genetic version of a multistage rocket.

Then in December it successfully launched a satellite into space from a multistage rocket, a move that was widely viewed as another test of the country's long-range missile technology.