If I was possible to travel across the universe.
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Anybody that's giving you a "yes or no" doesn't have any clue. Theoretically the universe could loop in a circle, but with equal probability, it doesn't. Nobody will ever know the true shape of the universe, for it is impossible to know where it's "edges" are. Any said shape of the universe is purely theoretical and would need some hefty mathematics to back up that idea. For all we know, the universe could be the shape of a tesseract, but again, with equal probability, it's probably not.
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No.
You would simply arrive at the "other side" of the universe.
But note that all the "edges" of the universe are expanding away from each other at a significant speed (at least half the speed of light). So it would take a long time to make such a trip.
Your path through the universe would inevitably not be a straight line, because of the gravity of galaxies that you would pass by. But your path would essentially keep taking you almost directly away from your starting point.
You would simply arrive at the "other side" of the universe.
But note that all the "edges" of the universe are expanding away from each other at a significant speed (at least half the speed of light). So it would take a long time to make such a trip.
Your path through the universe would inevitably not be a straight line, because of the gravity of galaxies that you would pass by. But your path would essentially keep taking you almost directly away from your starting point.
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if you are talking were you keep going for a long time and end up in the same place or were you started, i say yes and no because we would have to travel a long long long time and if it never looped people on earth would never know because they would be thinking there still going and people on the craft would never know when it ends or keeps going.
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Yes, the universe is an oblate spheroid similar to many, if not all, or most planets, but with a more elongated horizontal/longitudinal bulge, relative to the earth.