[Fhgzmftq]

e.g. they talk about accellerating without applying a reactive force.
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The energy [at least according to Star Trek] is obtained via anti matter, matter anhialtion.
But we also have other means possible including ZPE, and or an as yet undiscovered "new physics"



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Originally Posted by B.C.
JPL has been working on the manipulation of space/time as a means of propulsion for a couple of decades
Ref?
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I actually thought the work JPL did was well known....
From the article...

Historically, gravity has been studied in the general sense, but not very much from the point of view of seeking propulsion breakthroughs. With the newly formed NASA Breakthrough Propulsion Physics program, that situation is changing.

Your's truly was at the JPL Lab and work site outside LA just recently