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An unidentified flying object (UFO) is an object observed in the sky that is not readily identified. Most UFOs are later identified as conventional objects or phenomena. The term is widely used for claimed observations of extraterrestrial spacecraft.
originally posted by: halfoldman
Extraterrestrials could simply mean beings like us who live outside earth, whereas "aliens" implies completely different lifeforms.
originally posted by: neo96
Contrary to urban legend.
Aliens from space haven't been proven to exist.
Carl Sagan certainly understood the science involved and he said it was plausible that aliens have visited the earth in the past, though he never saw evidence of this.
originally posted by: james1947
I truly hate it when someone makes an uninformed statement like this...Makes me think that they have unrealistic expectations of the evidence available, or they do not understand the science involved.
Evidence
I don't know if off-worlders deserve more or less respect than aliens from other countries, since I've never met any off-worlders.
However, referring to ET as an "alien" is incorrect. Off-worlders, while technically "alien" should not be lumped into the same class as we would Mexicans, or Canadians, French, German, etc. You should observe a bit more respect for the individuals involved...
originally posted by: Arbitrageur
Carl Sagan certainly understood the science involved and he said it was plausible that aliens have visited the earth in the past, though he never saw evidence of this.
He did see what you suggest is "evidence" and explains why it's not scientifically viable, so perhaps it's you who neither understands the science, nor the expression "extraordinary claims require extraordinary evidence".