Could Space-Time Variability Explain Unexpected Spacecraft Speeds?

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if the time component of space-time is not a constant as assumed, i think it could explain the old question of why our spacecraft don't move at the expected speed/acceleration.

http://www.dailygalaxy.com/my_weblog/2009/11/rosetta-space-mystery-could-be-clue-to-a-new-physics.html#more
 
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this should be a testable idea. for example, the time-correction necessary to match the velocity and/or acceration for all the discreptancies, pioneer probe, voyger probe, gravity assisted acceleration, etc. ...should be identical.
 
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