high specific impulse

High specific impulse refers to the efficiency of a rocket engine, indicating how effectively it uses propellant to produce thrust. It is measured in seconds and describes how much thrust is generated per unit of propellant consumed. A higher specific impulse means the engine provides more thrust for less fuel, allowing spacecraft to travel further and more efficiently. This attribute is crucial for missions that require reaching distant destinations, as it optimizes fuel usage and reduces overall weight, enhancing the vehicle's performance during flight.