Source: Starfinder Core Rulebook p.105
As a full action, you can perform a disarm or trip combat maneuver against a target within 30 feet. Use your Charisma modifier on your attack roll instead of your Strength modifier, and you gain a +4 bonus to this attack roll that doesn't stack with the bonus from the Improved Combat Maneuver feat.
When you are attuned or fully attuned, if you disarm a target with gravity surge and have a hand free, the dropped item flies toward you and you can snatch it from the air. If you trip a target with gravity surge, you can pull the target up to 10 feet closer to you.