CONS 127 Lecture 5: CONS 127 - GNSS Jan 23 2018
21 Sep 2018
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As we get higher, the air molecules get less. *remember that there is no definite line separating our atmosphere from space. If you are close orbit to the earth faster orbit. If you are farther from earth slower orbits. 4 main orbits (from farthest to nearest: geo-stationary: 36 000km away. These satellites match the rotation speed of the earth. *there is no relative motion, so the satellite is the same point in the sky. Suited for: weather monitoring, phone companies, other communications, tv: far-elliptical: 20 000km away. Suited for: earth observation: low-earth orbit: 400 km. **remember: the international space station is in this orbit. Interesting fact: the moon is furthest away from all of these orbits. Two reasons to explain why we have so much space junk: us we keep on launching satellites, collisions. Plus, because satellites didn"t have engines before, when they died, they were unable to come back down. More accumulation of space junk in our space.
