Considering that earth is not the only planet in the universe and that are many other planets in this same universe, it would almost be egotistical to believe that we are the only inhabitants in the universe on this single planet called Earth. As our technology has advanced to the point of visiting other planets, it would also be egotistical to believe that we are the only beings in the universe with the intelligence to travel among the other planets. It makes sense, therefore, to assume that yes, there could very likely be aliens on the earth either in the future or possibly even in the now.
No aliens are actually known and proven to have ever done so, so asking "how" is a bit premature.
There is no evidence of any kind to support the idea.
There is no reason to think so. So far, there is no actual hard evidence that aliens actually exist.
There have been many reports of encounters with aliens, which have not been verified or admitted publicly by the government.
There is no evidence of any kind to support the idea. NO.
If by 'aliens' you mean intelligent extra-terrestrial beings, there is no plausible evidence that any have ever visited Earth. However, with billions of planets in the universe, it would be arrogant of us to believe that we are alone, as the only intelligent life forms that ever evolved. There must be 'aliens' out there.
if aliens are on earth why does it matter, there awesome
have aliens vist earth any time
The Aliens of Earth was created in 1993.
After I am dead hopefully! liedetector2000: one day my friend. one day.
The Aliens of Earth has 327 pages.
Since alien visits are not necessarily observed by us, or even if they are observed, they may not be possible to confirm, we cannot be certain how many times aliens have been on Earth, however I will say that we have no clear evidence that the Earth has ever been visited by aliens from outer space. That remains speculative.