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orbital velocity

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
orbital velocity [′ȯr·bəd·əl və′läs·əd·ē]
(astronomy)
The instantaneous velocity at which an earth satellite or other orbiting body travels around the origin of its central force field.


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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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