Phase Four Maxwell to test green propellant
Capella Space and Phase Four reveal Maxwell Engine performance
Phase Four announces new electric thrusters, subscription program
Phase Four raises $26 million
Phase Four wins Air Force contract for electric thruster development
Phase Four launches first plasma propulsion systems
Capella Space gets ready for primetime as constellation operator
Phase Four wins orders for smallsat electric thrusters
Phase Four aims for constellation orders
More startups are pursuing cubesats with electric thrusters
Phase Four wins NASA and commercial deals for electric propulsion system