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strabismus | 22:42 Fri 29th Sep 2017 | Science
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The radius of a satellite's orbit is inversely proportional to its velocity. If a satellite is slowed by drag and its velocity not corrected by thrusters, why does its orbital radius not increase?
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The key word is "inversely"
Seems other factors will change.

https://en.m.wikipedia.org/wiki/Orbital_speed
because it is in freefall in a gravity well, any slowing will send it spiralling down.
A certain orbital velocity is essential to equally compensate for the acceleration of gravity at any given orbital radius. Absent the force necessary to acquire a higher orbit the reduced orbital velocity of the satellite can no longer compensate for the pull of gravity at that altitude. Gravity is inversely proportional to distance squared.

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