Tech expert Kurt “CyberGuy" Knutsson says 329,000 mph fusion rocket promises to be fast, disruptive and enable deep-space missions.

Credit: NASA, public domain Before we dive into the world of ion thrusters, it’s important to understand the concept of specific impulse and fuel efficiency for rocket thrusters of all kinds.

This high thrust allows the rocket to accelerate faster. These systems also have a high specific impulse. Specific impulse measures how efficiently the propellant is used to generate thrust.