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orbital velocity

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
orbital velocity
n.
1. The velocity at which a body revolves about another body.
2. The minimum velocity required to place or maintain a satellite in a given orbit.

orbital velocity
n
(Astronomy) the velocity required by a spacecraft, satellite, etc., to enter and maintain a given orbit


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This is because the rotational velocity of the earth is much smaller than its orbital velocity.
The stars in both halos are so far away from the center of the galaxy that their orbital velocity requires more gravity than visible matter supplies.
Carrying the analogy further, let''s start with a mountain and a pebble falling from the sky from orbital velocity ?
 
 
 
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