Flyby: The probe flies by an astronomical body, but does not orbit it Orbiter: Part of a probe that orbits an astronomical body Lander: Part of a probe that descend to the surface of an astronomical body Rover: Part of a probe that acts as a vehicle to move on the solid-surface of an astronomical body Penetrator: Part of a probe that impacts an astronomical body Atmospheric probe or balloon: Part of a probe that descend through or floats in the atmosphere of an astronomical body Sample return: Parts of the probe return back to Earth with physical samples