FTL, faster than light speed, is science fiction. It’s a convenience for making a great story. It is not possible to travel faster than the speed of light now or ever. You could, sometime in the distant future, reach a fraction of the speed of light, however, but even if you could achieve 1/10th the speed of light, a speed presently absolutely impossible, it would still take over a thousand years one way to reach the Trappist-1 system, a mere 40 light years away. This is because at 1/10th the speed of light it would take 400 years, but it would also take about 300 years to achieve that speed and another 300 years or so to slow down once you get there. These speeds are so incredibly fast. No propulsion system exists, and the fuel required would greatly weigh down the craft’s ability to both accelerate and slow down at the other end.
So I’d like to know why the aliens did it, and ask if they live that long or maybe they had what’s called a “generational spaceship,” or one where many hundreds of generations of people are born and die in the course of the journey. There would be so many question to ask.
It’s the main problem we have about ever leaving our solar system with a manned mission.