So with our current knowledge, it’s not possible for us to explore other galaxies or even solar systems. But theoretically if we could figure out how to travel at or near the speed of light we could reach a lot of them, although only a small fraction that exist without being able to travel way faster than the speed of light.
However I am thinking way before reaching the speed of light we would surpass our own ability to steer a ship to avoid planets and asteroids. But also near the speed of light would that make it not possible for even electronic guidance to work. I doubt we could design an electrical signal to be faster than light, and enough faster for then guidance manipulation/maneuvers to take place.
Or is the guidance possibility just another piece of the puzzle we are unable to conceive of yet?