engines interacting with moving land over long branch of space appearance weathering
jet_propulsion is reaction_propulsion. cars_can_move_because has engines ion_engine is reaction_propulsion_engine. wayfaring is travel. propulsion_of_aircraft is impelling. reaction_propulsion_engine is engine. atmosphere is open_space. jet_engine is reaction_propulsion_engine. propulsion_of_jet_planes is impelling. intergalactic_space_travel is infeasible.