I have seen a lot of scientific evidence that shows how life can form from natural processes. Using that and my understanding of evolution, I have little doubt that there is life on other planets. I’m also convinced that there exists what we would call intelligent life on other planets. When it comes to life that can traverse the universe I hesitate to have any confidense. If we find it to be possible, with warp technology or wormholes, then I will assume it could have been discovered somewhere else as well. The biggest hold up I have for such advanced species is the tendency for extinction from societal competition or extraplanetary forces from asteroids to star death.