ExoTerra is a manufacturer of fully-integrated electric propulsion systems for small and medium satellites. The electric propulsion systems are built around xenon and krypton Hall-effect thrusters.

The Halo family thrusters are designed to be compact, lightweight, magnetically shielded for extended operational lifetimes, and can operate on xenon or krypton.

Halo thrusters are operated with Exoterra's power processing unit (PPU), which offers the high-efficiency operation, simple interfaces with spacecraft avionics, and full throttleability across a range of power inputs.

The company's drop-in propulsion modules are designed to make spacecraft design and integration simple. The tankage, layout, performance, and power input can also be customized where needed to suit individual customer needs.

The company's Halo- and Halo 12-based Courier and Courier XL buses provide all spacecraft propulsion, power, and housekeeping functions for missions in LEO, GEO, or lunar orbit.