I wonder if aliens exist.

From this website I learned that there have been unexplained sightings for centuries. From crop circles to skulls that are bulging on the head that were found on earth. Many UFO (Unidentified Flying Objects) have been seen over the centuries. I think some could be hoax though. Even in 'The Madonna with Saint Giovannino ', other wise known as the UFO painting, A man and his dog can be seen in the background staring at a flying disk. There are also cave painting that have indicated to alien existence. Many astronauts have recorded sightings as well. Buzz Aldrin, who was aboard the Apollo 11, recorded that he saw something flying next to them and he thought it was the final detachment until mission control confirmed it was 6000 miles away from them. Also Bill Clinton spoke continuously on the existence of aliens and speaking his opinions on the 'independence day'. So there is a lot of evidence leading up to it and I think alien existence could be a very high possible theory.

Now this makes me wonder if they will ever strike us and are just waiting for a prime opportunity.. ??