Apollo Fusion ACE thruster operating with Xenon propellant. Photo: Apollo Fusion Apollo Fusion has been selected to provide the propulsion system for a Low-Earth Orbit (LEO) satellite constellation placed by York Space Systems. The order marks a string of successes for the propulsion start-up as it recently signed its first four commercial deals — with Saturn Satellite Networks’ constellation, U.S. Air Force intelligence satellite. Apollo Fusion will provide the electric propulsion system for an unnamed customer with a LEO constellation of 10-plus satellites anticipated to launch in 2022. CEO and founder Mike Cassidy told Via Satellite that this is a significant deal for the company because it could expand to 200 propulsion systems as the constellation is already funded for growth.