Is it, really? I believe we know too little about aliens to assert that such a thing is unlikely: for example, what percentage of planets have life, what percentage of that is intelligent life.
It seems likely that there are other planets with intelligent life. However, if they have found way around the speed limits set forth in the General Theory of Relativity and therefore are able to travel the distances involved, they would be so far ahead of us that we would be completely uninteresting to them.
no
There is no solid proof aliens even exist much less have visited Earth.
Aliens visited Earth & advanced man's progress on more than one occasion.
A few think yes, most think no, but the argument won't go away.
Aliens have never visited Saginaw.
ALL OF THeM!! But seriously: We know of no planet except Earth with life on it in our solar system, and the conditions on other planets forbid advanced life. There are planets belonging to other suns, but they are very far away, and we have no information about life on them. It is extremely unlikely, but not impossible, that aliens from other solar systems have visited our solar system.
There has been no absolute proof that we have been visited by anything or anybody. Until then we can assume we're alone.
napasapa
There is no scientific evidence or consensus to suggest that aliens have ever visited Earth. While claims of alien sightings and encounters have been made, none have been substantiated by credible scientific investigation. The existence of extraterrestrial life remains an open question, but to date, there is no definitive proof of interactions between aliens and humans.
they will kill us all!!!!! Aliens from outer space, despite all UFO cultists and anecdotal evidence from people claiming to have been abducted, and so forth, remain entirely hypothetical. We have no clear evidence that such aliens exist or that they have ever visited the Earth. There may, of course, be aliens living on other planets, but we have absolutely no way of knowing whether they will ever visit the Earth, and no way of knowing how they would behave if they were to do so. Many people, including myself, would like to believe that if such aliens were to visit the Earth they would do so in the spirit of scientific investigation of the universe, and they furthermore would freely share their knowledge with human scientists here on Earth. But we cannot really know what they may wish to do. I think it is unlikely that they would come to Earth in order to eat us, but I cannot rule it out. Realistically, the stars are extremely far away, and it would be extremely difficult to travel from one star to another. Very likely, it is not going to happen. Aliens are unlikely to visit the Earth, and therefore the question won't arise, of how they would behave were they to do so.
if aliens are on earth why does it matter, there awesome
have aliens vist earth any time