We’re assuming you can’t break the speed of light or interact with the other worlds.
It’s a one-way influence. You can influence the spaceship before it leaves your light cone (you can give them supplies, etc). The MW argument is that you can influence parallel universes before they split off.
We’re assuming you can’t break the speed of light or interact with the other worlds.
It’s a one-way influence. You can influence the spaceship before it leaves your light cone (you can give them supplies, etc). The MW argument is that you can influence parallel universes before they split off.