I know what you are all thinking. Pete mate, this conspiracy theory has been looked at a dozen times, what can you offer us? Well, after a little research (googling it up), I found that most reports of alien visits to Earth were based upon whacky and somewhat messed up stories. Tales of big eyed long finger galactic foreigners arriving on earth to graffito our crops and probe our behinds sounds all to primitive for an alien race that has achieved the ability of galactic travel. So what makes the theory that aliens are out there and that they have visited earth so compelling, well that's what I am here to do.
Probing: It can get rough sometimes
Did E.T phone home?
Its easy to say that any claim that aliens are out there is just a fruitless attempt by nerdy sci-fi geeks to feed their fascination.Yet, I believe that the Roswell case gives us the best piece of evidence that indeed something from somewhere else did arrive on Earth. The first piece of evidence is the fact that the military claimed that they had found what they labelled a 'flying saucer'. However, within an hour of claiming the find, the military quickly changed their tone stating they found a downed weather balloon. Now I'm not expert on aircraft but I think I would know the difference between a downed weather balloon and an aircraft from a foreign world. But hey lets give them the benefit of the doubt on this one, if you were a solider stationed in the Las Vegas desert, you would probably tell yourself you saw a UFO too.
However, this is not where the evidence ends. The military has continuously changed their story on the matter, which has only fueled the fires of belief. From the weather balloon story to claiming that they were conducting research to detect Soviet atomic capabilities, the Roswell base has been shrouded in mystery and military confusion.
Lastly, and this is just out of sheer speculation. If aliens have been visiting and monitoring earth for a long period of time then there has bound to have been an incident where an alien craft malfunctioned and crashed down to earth. Now, I am a firm believer that if there is alien life out there, they are probably much like us. Not in appearance, but in their flaws. Much like us, aliens with be susceptible to making errors here and there. It is probably true that no ones perfect, even in our vast universe. Using this train of thought it isn't hard to think that the incident that occurred in the Las Vegas desert in 1947 was perhaps the result of an error on an alien craft.
Thus in conclusion I have to say....
Verdict: True, aliens have and are probably still visiting earth. But they aren't probing us.