Nowadays many people do believe in aliens but didn't have idea what is alien is.
But now I give you some facts that alien do exist.
First. The great pyramid of Giza. Are you familiar with these pyramid ? Its a three pyramid located in Egypt. People still believe that pyramids are made by human during slavery time o paraoh's time in egypt. Even 100 mens cant lift or push those big rock. Every rock weight tons.
Second, this pyramid of Giza is exactly opposite above the constellation of Orion' Belt (Tres Marias).
Third, if Pyramids are made by humans why there's a pyramid in Mars and Moon ?
Doubtful arguments, pyramids built by slaves for 18 years, is a historical fact, which has long been proven by scientists. Aliens exist because there are many stars in the universe with planets. But not aliens built pyramids - that's for sure.