1. SATELLITES

2. Artificial Satellites
Natural satellites
A celestial object
travels around a planet or dwarf planet (ex a moon)
Artificial Satellites
Man-made satellites circling at different altitudes and orbits
Forecast weather
Monitor agriculture
Telecommunications/navigation
Military activities
Explore the universe

3. In 1957, Soviet union launched the 1st satellite, Sputnik 1 into space

4. In 1962, Canada launched, Alouette 1 into space

5. Canada’s Contribution
Canada’s MOST "My Own Space Telescope" Space Telescope
probes stars outside the solar system
measures changes in star light emissions.

6. Canada’s RADARSAT Satellite (Polar orbit)
monitors a variety of natural & human-made events
ex. charts icebergs in Canada’s far Artic ocean

7. Canada’s Communication satellite Nimiq 4
Sends TV broadcast signals across most of North America

8. STAYING IN ORBIT Earth’s gravity pulls the satellites toward earth BUT
This is balanced by the forward motion of the satellite & the curvature of the earth

9. REASONS FOR LAUNCHING SATELLITES
Measuring characteristics of planets around distant stars.
Searching potentially dangerous asteroids
Determine the positions of given objects on the surface of the earth
Track weather

10. Types of Orbits Low earth orbit satellites Medium Earth satellites
Altitude of up to 2000km
Provides global coverage.
Monitor around the world (ice caps) Polar Orbit
Travels at an altitude of 200 – 900 km in a path over both the North & South pole
Medium Earth satellites
Altitude of up to km.
Global Positioning System (GPS)
Satellites used to find positions of objects on the earth
Geostationary satellites
Orbital path directly above Earth’s equator.
Altitudes of km and appear motionless
in the sky
Useful in communications, weather tracking …

12. HUBBLE TELESCOPE
VIDEO