Sounds like it was written by a sub-highschool level writer.
Even if the "lightweight and pulsation" of the craft lets it reach almost light speed, it would take over 2 million years for any "aliens" to get to our galaxy from the next closest galaxy. And it is literally IMPOSSIBLE for something to reach light speeds, especially since to reach those speeds, that matter has to become completely made up of light particles. I do believe there are other intelligent beings in the universe, but, for them to come into contact with us is unfathomable and quite childish to say the least