. . . "Covenant starships use Repulsor Engines for low-level propulsion. Little is known about its mechanisms, other than that they produce quantum fluctuations that can affect personnel within range of them, and they leave a wake that can affect starships. It's possible that Repulsor Engines could be a form of \"reactionless drive\" that makes use of negative matter. Negative matter would have negative mass and would have a \"repulsive\" effect with the normal matter if placed behind the ship."@ja . . . . . . . . . . "Repulsor Engines"@ja . . . . . . . . . . . . . . "Covenant starships use Repulsor Engines for low-level propulsion. Little is known about its mechanisms, other than that they produce quantum fluctuations that can affect personnel within range of them, and they leave a wake that can affect starships. It's possible that Repulsor Engines could be a form of \"reactionless drive\" that makes use of negative matter. Negative matter would have negative mass and would have a \"repulsive\" effect with the normal matter if placed behind the ship."@ja . . .