9.1  Satellite

1. Satellite: an object which orbits planets or stars

2. Types of satellite orbits

  • HIgh Earth Orbit (HEO)
  • Low Earth Orbit (LEO)
  • Geosynchronous Orbit (GSO)
  • Geostationary Orbit (GEO)
  • Medium Earth Orbit (MEO)

3. Orbit shapes:

  • Circular
  • Elliptical

4. Specific positions of satellites in the orbits:

  • Apogee
  • Perigee

5. Relationship between orbital height and satellite velocity

  • The higher the orbital height of a satellite, the lower the satellite speed for it to remain in orbit 
  • This is because the gravitational force on a satellite decreases when the orbital height of the satellite increases

6. Methods of sending launch vehicles into orbit

  • lauch vehicles: used to send satellites or spacecraft into outer space
    • expendable launch vehicle (ELV)
    • reusable launch vehicle (RLV)
  • ways to send launch vehicles into orbit:
    • directly into orbit
    • Hohmann transfer orbit

7. Zero gravity: the condition when no significant gravitational force effect is felt

8. Impact of rapid development in space technology:

  • increased waste in space / space junk
  • increase in research and development activities