I think there are a lot of life forms out there and that it is not particularly unique. The biggest issue is obviously travelling through space. Also, there is the question of whether it is intelligent.
Also, there could have been and already gone extinct intelligent life forms out there.
We are the only intelligent life form on Earth with the ability to travel in space and we are extremely young in comparison to the age of the universe or even Earth, and we are already ruining our planet and could potentially go extinct at any moment, should we get hit by something from space. We have no backup plan (no other planet to go to) or real defence against it.
Is it likely that an asteroid will impact Earth in the near future?
While no known asteroid larger than 140 meters in size has a significant chance to hit Earth for the next 100 years, only about 40 percent of those asteroids have been found to date.
Would it be possible to shoot down an asteroid that is about to impact Earth?
An asteroid on a trajectory to impact Earth could not be shot down in the last few minutes or even hours before impact. No known weapon system could stop the mass because of the velocity at which it travels – an average of 12 miles per second.
Whether such life forms would look like humans is difficult to say, but I do think that such creatures if they should be able to space travel would need some of the same capabilities as humans, such as being able to construct things, so they would need some sort of way to grab stuff and use tools. And not really sure what design would be better for that than a hand.