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To: Ilaine who wrote (7743)	8/26/2001 5:37:49 PM
From: Don Lloyd	Read Replies (2) \| Respond to of 74559

CB - ...Sorry, Don, but I am correct that satellites need to use thrusters to correct for gravitational pull and provide momentum control. You claimed - Message 16261207 Gravitational pull is affected by mass and distance. The bigger the mass, the greater the gravitational pull. The further the distance between the masses, the less the gravitational pull. For an object of the same mass, the further the distance, the less the pull. The closer the distance, the greater the pull. LEO satellites orbit closer to the earth, so to keep from being pulled out of orbit, they are made smaller.... Your references say - ...Small thrusts are required to correct for the tug of solar or lunar* gravity and to reposition the satellite in its proper orbit and altitude. ...* Without looking for references, I make the unsupported claim that neither solar nor lunar means earth. -g- A satellite in any established earth orbit only remains in orbit because of earth's gravity, instead of shooting out into space along its instantaneous velocity vector. Earth's gravity is not something to be overcome in this case. If you limit yourself to the claim that a satellite with a larger mass requires a larger propulsion force to accomplish a given amount of acceleration and velocity change in a given time, there is no problem. You only run into problems when you bring the earth's total gravity (ignoring gravitational anomalies) into the explanation mix. Regards, Don