An alien is either (1) an extraterrestrial being (a being from outside our planet), or (2) a person, being, or thing from another country, or even (3) a person, being, or thing that is simply outside of our experience.
Meaning (1) is hypothetical, i.e., it is not confirmed whether there are living creatures on other planets. I would like to think there are, but this has not been confirmed.
Since we have not meet extraterrestrial aliens, we do not know. Yet.
If you meant ALIENS... Then yes or no depending on who's view it is. To another human being, people are not aliens. From the view of an extraterrestrial being from the universe we would be.
Maybe similar with 'outlander' movie
There is no evidence that proves any of them are even extraterrestrial for certain. There is no Evidence that proves any of them are not extraterrestrial for certain.
Extraterrestrial life forms-if they exist.
At the moment there is no credible evidence that there are any extraterrestrials on earth.
There are so many things that could not be a falsifiable hypothesis. One statement that is not falsifiable is that humans need air to breathe.
If there are any they would not be from EarthAns 2.There are lots of aliens and they are from Earth. Anyone you meet in your country who is not a citizen of your country is an alien. By definition - look in any dictionary.UFOlogists would find fewer people laughing at them if they learned the word extraterrestrial.
A person who believes in aliens is often referred to as an "alien enthusiast" or someone who is "believes in extraterrestrial life."
Extraterrestrial life is defined as life that does not originate from Earth. Life on other planets is a simpler way to word it. Aliens on other planets is an example (but I doubt aliens live on other planets) of extraterrestrial life. Also, bacteria are another example. There is proof that there was once water on Mars, and that there may have been bacteria living in that water. That bacteria would also be considered as extraterrestrial.
There is currently no scientific evidence to suggest the existence of aliens on Rigel or any other star system. The search for extraterrestrial life continues to be a topic of interest for astronomers and scientists.
No, aliens do not need a passport to travel to Earth as there is no confirmed evidence of extraterrestrial life visiting our planet.