Three impulse (rocket) types and three constant acceleration brachistochrone types. “Impulse” means the spacecraft makes an initial burn then coasts for months, which is a standard rocket mission.

"Delta-v" is how the space industry measures the change in velocity that a spacecraft is capable of—more precisely, it is a measure of the impulse per unit of spacecraft mass.

Impulse Space, a leader in the development of in-space transportation services, announced today it has been awarded a $34.5 million Small Business Inn ...

201: Propulsion System Function and Mission Purpose of Spacecraft in the Vehicle Thrust/Weight Ratio vs Specific Impulse Plane (Geolunar Space) ...