From the MCU to Interstellar, wormholes (Einstein-Rosen Bridges) are the most common means of galactic transport in science fiction.
A spaceship simply enters a wormhole, then comes out on the other side, galaxies away from when it started, which begs the question: how?
You are in control of a spaceship 🚀. To complete your mission 🏁, you must head from Galaxy A to Galaxy B, 400 light-years apart.
Even if your spaceship could travel at the speed of light (3x108m/s), it would take you a whopping 400 years to get there!
It's going to be a loooong flight... 😴
What if you could bend space?
See the paper in the picture above?
Instead of travelling across the paper, you can simply fold the paper until "Galaxy A" and "Galaxy B" touch. Voila! You now have a shortcut!
Albert Einstein, the famous physicist, suggested that gravity was caused by a warping of space and time.
So, in theory, the gravitational fields of large celestial objects might be bended space.
If this theory is right, we might actually be able to travel on an interstellar scale with ease.
With a large object (possibly a giant planet), provided that it has a large enough gravitational field, we may be able to travel through the warped space and end up in a galaxy far, far away!