I have written about this in quite some detail and the answer in short is: Death. That could be us or them, whoever defends themselves first. Some aliens are just as weak as me and you and some are very strong, most can be killed by shooting, some can be killed by stabbing, just remember if you don't kill them, they will almost definitely kill you (95% chance). Even if they choose to keep you for testing first they will probably kill you after they have got what they want; when you have made contact with an alien there is not going back unless you defend yourself by killing them. See these two Wiki answers for further information.
beacuse aliens come from another you it versr they are more at vanict
"Why wont aliens kill humans" ... Theyre afraid.
'Aliens' are real. In any given country, a foreigner may be described as an Alien.
no, they did not.
Aliens didn't build the pyramids, actual humans did that.
Afghans are not aliens. They are humans just like everyone else.
No aliens are known to exist, so your question is unanswerable.
humans aliens bugs
no
Aliens are not known to actually exist, so your question is unanswerable.
No!!! Humans can not turn into aliens. Alien do not even exist...
Some would say aliens and doctors both examine people. Some who believe in outer space aliens believe they examine humans to try and understand humans.