May I ask what galaxy is this?We won't be able to reach that galaxy to test out whether we would need to do anything special or not to play tennis or use a microwave oven. However, from the point of view of anyone on that galaxy moving away from us, we are in that situation right now. They think we're moving away from them at a fast speed.
What I am trying to say is who is THEY in the galaxy?
How does one know there is anyone in that galaxy and if so how can one reach such conclusions if they have never actually experienced it themselves?