I know there is some discussion in space/planets..
The Rabbi I asked this shabbat pretty much said the same thing; and you go by Jerusalem time when in doubt.
However, afterwards I was thinking about the laws of relativity and space-time. So based on our current understanding of relativity.. time and space are not always "static".
Example being the faster you move in space the slower time goes.
So if we start cruising off to other planets are very high speeds, time would "move slower".. and 25 earth-hours will not equal 25 hours in your spacecraft or whatever it may be.
So how long does shabbat last in space at "warp" speed?
Maybe I watch too much sci-fi.. thanks in advance.