Let’s say we were able to create a 2-way traversable inter universal wormhole. This wormhole can both travel inside of and to another universe. You could fix the momentum problem like this: say we make each of the portals move relative to where they are. Because you’ll be going through the portal, during the travel your body assumes the momentum of the second portal and thus the point you come out of. Even if it is an infinitesimally small distance you cover. That way you could travel between 2 points regardless of what their momentum is because one portal is moving relative to you, the other wherever you’re going.,(reply>), Love the video btw.