This document defines key vocabulary terms related to space exploration including: universe, which is defined as the whole of space and everything in it; satellite, an object that moves around a bigger object in space; circle, to go around something in a circular motion; reach, to arrive at a place; exist, to be present in the real world; carry out, to do and complete a task; far-fetched, not easy to believe because it is improbable; and space, the area beyond Earth surrounding the planets and stars.