Well, no one knows whether they exists or not. People reported seeing space ships and some of them captured in their recording devices too. But its not the sufficient proof to say they exists or not.
I think there is other life in the universe. We cant be the only one.
That is my opinion but i dont know if they have been here or is here right now.
But i say YES there is life in space!
well i certainly believe they do exist.there are many evidences in history.recently a tape was shown on a TV channel too regarding the same.i don't remember the details but it was regarding an alien been caught by armed forces.all the evidences can not be fake.
even if he had absolutley no evidence of videos and pictures....the probability of an extraterestrial specie to exist is very high because we are a very small planet in a huge galaxy...(and there are 395203958203850 galaxies)