Earth’s orbit is so populated that the space industry is now developing technologies to remove space debris caused by satellites from an over-crowded low Earth orbit (LEO). One untapped orbit ...

But the twentieth-century saw a technological explosion of new rocket-propulsion systems, using both solid and liquid propellants. Rocket-powered vehicles were developed for two primary purposes: ...

Turns out this actually reduced the air velocity through the thruster, so he quickly switched back to the original configuration. Tests on a single stage of the thruster were very promising ...