Luigi Caselli wrote:
Il 17/02/2021 15:33, ha scritto:
This extremely important message can't be stated enough :
What part of : Distance = Speed x Time , don't people understand ? !
Even at speeds approaching light speed ( very unlikely in any case ) , interstellar distances are still way far too great !
Why thinking of interstellar travel?
The UFO or more correctly UAP (unidentified aerial phenomenon) could
come from the Earth itself.
Luigi Caselli

I agree the "mostly likely" interpretation of the data at this point
is a bunch of "aliens" that seem a lot like humans. Maybe they have
interplanetary capability but they seem hang out in obscure parts
of the earth "a lot" of the time.

But interestingly the "space warp technology" some physicists argue
UFO's exhibit from time to time (e.g. "shape shifting") is a potential
FTL drive.

Warp drive uses the same part of General Rel that allowed the universe
to expand to ~100 bn LY diameter in 13 bn y.

An aquaintence from Harvard has been working on the detailed math which
was roughly worked out decades back (I thought).

It got me thinking and maybe it is a key point. If you can make
the local structure of spacetime bend even a bit not only can you move
from A to B without actually travelling through space (so no FTL problems)
but it might also explain the "walking through walls" stories,
being able to withstand huge pressures at the bottom of the sea
(i.e. make your ship look like a flat plate to the sea water ,
even travel through solid rock underground, in and out of volcanoes (if you
can make yourself appear flat or small then no heating problems --
square cube rule), and probably many things I havent thought of.

--
Alcubierre drive - Wikipedia
The Alcubierre drive, Alcubierre warp drive, or Alcubierre metric (referring
to metric tensor) is a ... Alcubierre interpreted his "warp bubble" in terms
of a contraction of space ahead of the bubble and an expansion behind, ...
arXiv:gr-qc/0406083.
-- wiki

Conformal Gravity and the Alcubierre Warp Drive Metric
GU Varieschi ? #Cited by 11
Similar issues also exist in other well-known GR solutions for super-luminal
motion, such as space-time wormholes. Einstein's general relativity and the ...
-- www.hindawi.com