Even though "sited" means "located", we have a hunch that you're asking
where they were seen, or "sighted".
The answer is: There has never been any credible evidence, that stood up to competent
scientific investigation, that any terrestrials have ever seen any extra-terrestrials.
Barlowe's Guide to Extraterrestrials was created in 1979.
The ISBN of Barlowe's Guide to Extraterrestrials is 0894805002.
Nowhere in the Bible are extraterrestrials mentioned in any way.
Understanding - 1994 Extraterrestrials was released on: USA: 29 August 1998
No
Near sited means you can't see far away
'Sited' means placed at a certain spot, and 'Cited' means to quote something, usually a law or regulation.
For a start, there isn't any solid evidence for extraterrestrials so far. Of course, there are arguments (mainly of a probabilistic nature) that there SHOULD be extraterrestrials, but that's about all.
National Geographic Explorer - 1985 Searching for Extraterrestrials was released on: USA: 4 December 1994
Although we have no definite knowledge of any extraterrestrials, and we certainly do not know that any extraterrestrials have received any messages from us, we have sent a number of things into space, notably radio and TV broadcasts and various robotic space probes, which would convey information to extraterrestrials if the hypothetical extraterrestrials received them.
Spacing Out - 2012 Searching for Intelligent Extraterrestrials 1-49 was released on: USA: 10 May 2013
the existence of extraterrestrials is a paradox