1. Notes for Thursday’s Quiz Satellites and Flight

2. What is a Satellite? ► an object that revolves around another object in a path called an orbit ► Can be man-made or artificial ► Can be natural

3. Natural Satellites ► Examples:  All the planets because they orbit around the Sun  Any moon because they orbit around a planet  Rings of planets, asteroids, comets, meteors, meteorites, and particles of dust and debris

4. Role of the Sun ► keeps objects in orbit with its gravitational field ► alone accounts for about 99.8 percent of the mass of the solar system

5. Artificial Satellites ► Spacecrafts built and sent into space by humans ► Perform ‘jobs’ for humans  Collecting data  Pictures  Sending signals (phone or TV)  Global positioning system (GPS) ► May have human crews aboard  US Space Shuttles  International Space Station

6. How satellites stay in orbit. ► Orbit- path in space that an object moves along around a larger object ► The orbital path needs an exact combination of height and speed or it will not orbit ► Gravity- force of attraction between masses (pull between objects)  Key in a satellites orbit

7. Why don’t satellites fall? ► Overcome the force of gravity by an exact combination of height (altitude) and speed (velocity)

8. Satellite positioning http://spaceplace.nasa.gov/en/kids/goes/goes.gif Geostationary- orbits with the rotation of the Earth stays over the same spot all the time Polar-orbiting- Orbits opposite of Earth’s rotation Can view most of Earth in minutes weather, climate, oceans, volcanoes, and vegetation patterns around the world http://spaceplace.nasa.gov/ en/kids/goes/poes_still.gif

9. Types of Artificial Satellites 1. Scientific- provides research and data  International Space Station ► Most complex international satellite ► Six research labs  Hubble Space Telescope ► Studies everything outside of Earth ► Sends astronomers 10-15 gigabytes of data each day

10. Types of Artificial Satellites 2. Communications-  sends signals back to Earth for human use (GPS, TV and phone)  Telestar ► First private satellite from AT&T

11. Types of Artificial Satellites 3. Environmental-  faces Earth and serves only to research and analyze Earth systems  Weather analysis and forecasting, Climate changes, Water temperatures, Atmosphere, Volcanic activity, forest fires, vegetation and ozone

12. ► http://news.yahoo.com/s/afp/20100425/sc_ afp/scienceastronomyextraterrestrialhawkin g http://news.yahoo.com/s/afp/20100425/sc_ afp/scienceastronomyextraterrestrialhawkin g http://news.yahoo.com/s/afp/20100425/sc_ afp/scienceastronomyextraterrestrialhawkin g