What are the Chances

What are the chances that aliens have visted the earth in the past century? I mean speaky frankly i believe in alien life but i feel that the chances of them reaching us is a long shot, because i just do not think the technology will ever exist to travel at or near the speed of light. I would just like to know what the members here feel about the chances, because between all the hoax's and the apparent "wave sightings" it is hard to take the majority of 20th century sightings for real. Lastly among all the sightings and storys, over the history of mankind, what do you feel is the most convincing.

the chances are "zero" if they did visit earth why wont they just friggin reveal themselves WTF!??!!??!?!

Because humans would shoot first and ask questions later... no, actually, they would take them to some secret laboratory and perform an autopsy.

Because a biologist studying an animal isn't going to say "hey, let me dart you in the ass and probe you" to a monkey, same thing with the aliens. Also if we are being studied by extraterrestrials they would be looking to gather data on us "in the wild". If it were made public, it would upset the entire social balance and probably mess up their data. Same thing we do when observing animals for scientific data, you hide in a blind and watch animals do what they do, instead of jumping out of some bushes and telling a herd of deer to "ignore me, just act natural,,,"

Especially if earth is their project in the first place. They may be the secret government so to speak, and we may be a sociopolitical experiment of some sort.

There are a bunch of other reasons, but tht's just one.