I've been reading some news threads posted by Lance where Goofy is skeptical, despite the overwhelming amount of legitimate, physical proof
Seriously, there are three main schools of thought:
1. The universe is huge and there have been other forms of life. However, those civilizations could be extinct, not interested in us as a species, or are too far away to travel here.
2. There are aliens and they have visited us throughout Earth's history. Interacting with and studying us, as well as imparting knowledge.
3. There are no aliens, we are the only form of intelligent life in the universe.
In one of Carl Sagan's lectures he postulated that if aliens had the intelligence necessary to travel the vast distances in space, they would not consider humans as a worthy species to communicate with. His comparison is how we view ants. I'm not sure that I agree with that because his supposition is that space travel = intelligence that's so advanced, we are no longer interesting as new life forms. When we found out water was likely present on Mars in a certain form, it caused a lot of excitement in our scientific community.
Space is tough to think about because of the vast distances and literal billions of years that have elapsed since the universe began. Entire star systems with planets have came and went, civilizations could have rose and fell a million times over, without us ever knowing about their existence.
We've recorded potential UFO's with cameras and on video. What interests me more are the ancient paintings both on canvas and on rock that depict alien life forms and crafts.
So, do you believe they've visited us?