Do not really know the truth, but obviously I do not believe in any aliens. I think aliens are just imagination, or aliens are still speculation
The mysteries that have been there. Could have news aliens there are aliens in the form of UFO photos and others is a hoax news that deliberately created or there is a mystery in it.
Universe is too big and extended for us to be the only sentient life form. They exist but IMHO they are too far from us. They still did not come to Earth