El Segundo-based Phase Four, which is developing thrusters for satellite propulsion, says it has launched one of its Maxwell engines into space. According to the startup, the engine was launched onboard a Capella Space SAR satellite which went into space on June 30th on a SpaceX launch. The company says the engine is its fourth delivered to space. The company is developing more efficient propulsion means for satellite positioning, using radio frequency (plasma) propulsion. The company recently raised $26M in a funding round.