1) The document discusses concepts related to achieving and maintaining orbit around Earth such as escape velocity, elliptical orbits with apogee and perigee, and how speed and timing can adjust orbits. 2) It also describes different types of unmanned satellites that orbit Earth including communication, weather, and navigational satellites as well as their purposes and orbit types like geostationary and polar orbits. 3) Satellites have provided many benefits for exploring space and applications on Earth such as television, phone calls, storm tracking, mapping, and rescue beacon detection.

1. 8 th Grade Chapter 2 Lesson Pgs. 85-90 (Stop at Unmanned Space Probes) For Student Use Only