no
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.
There is no evidence that any aliens exist so it is impossible to say how they may cause extinction.
At the moment there is no credible evidence that there are any extraterrestrials on earth.
There is no scientific evidence to suggest that aliens live on Mars or any other planet. The search for extraterrestrial life is ongoing, but as of now, we have not found any conclusive proof of alien existence.
There has not been any evidence of alien life so I do not know what you are talking about.
There is no evidence of any kind to support the idea.
No, Neil Armstrong did not encounter any evidence of aliens or a moon base during his historic moon landing in 1969.
There is no evidence to suggest that there are any aliens on the moon. All scientific exploration and research conducted so far have not found any conclusive proof of aliens.
Like all end of the Earth Theories, there is no solid evidence for the said event. There are only theories in science, and misconstrued stories of Mayan calendars and events in the bible, there are no solid reasons why the world should end in 2012.
There is no evidence of any kind to support the idea. NO.
No, Buzz Aldrin did not see any aliens on the Moon. There is no credible evidence to suggest that aliens have ever been observed on the Moon or encountered by astronauts during space missions.