FWIW, Michel.
The sudden disappearance of craft in encounters-sightings implys that when
a certain vacuum energy density is reached, the craft passes through
a "space-time portal" into another dimension and then pops back out again
at some distance giving an observer the illusion that they are undergoing
g forces that would squash the occupants.
Fred
>
> I rest my case and turn to frogs jumping out of the Grand Canyon (1600 meter spot)
> which requires mgh ~ = 8,000 nt-meters (or joules) for a 1/2 kg
> frog with great legs.
>
