If you want to visit another star system in any reasonable amount of time, you need to go fast. To go fast, you need a lot of energy. And that's what makes interstellar travel so dang hard. ... To make this work, the laser would have to use all the energy from every single nuclear reactor in the United States at once.

Will intergalactic travel ever be possible?

The technology required to travel between galaxies is far beyond humanity's present capabilities, and currently only the subject of speculation, hypothesis, and science fiction. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible.

Is deep space travel possible?

Physical exploration of space is conducted both by human spaceflights (deep-space astronautics) and by robotic spacecraft. ... Deep space exploration further than this vessel's capacity is not yet possible due to limitations in the propulsion technology currently available.