I am looking for a quick example of a famous scientist who had one or more outlandish theories.
I have a friend who is trying to call some research into disrepute not by criticizing the specific research but instead by criticizing some of the researchers’ more outlandish theories.
I know that famous, legitimate scientists also had some strange theories–I just can’t think of a good example.
Let me get this straight, your friend has no interest in attacking the argument but would rather attack the presenter? The fancy name would be Ad Hominem and it’s normally considered a logical fallacy.
Sir Fred Hoyle’s idea of viruses falling from space might be a weird enough idea that hasn’t been born out.
Sigmund Freud was certainly a seminal figure in the development of psychology as a science, but many of his theories are considered “outlandish” today. Carl Jung, even more so. (Nowadays, shrinks seem to prefer pills to “talk therapy.”) Or were you limiting this to the natural sciences?
I think there’s just enough of a possibility gap - with the suggestions Hoyle has made about particle size in interstellar space (a great deal the size of bacteria) - for it to deserve some credence. If you think about the scale of the arena on Earth for molecular “trials” to produce inheriting self-assembly there doesn’t seem to be nearly enough opportunity for that to be anything but extremely improbable.
You might also consider Pierre Teilhard de Chardin:
His work in paleontology was significant enough that you have to consider him a legitimate scientist. He also spent his life attempting to reconcile science with intense religious faith and mysticism, seemingly starting from a basic assumption that such a thing was possible. Look at the critique of “The Phenomenon of Man” by Sir Peter Medawar, basically ripping him a new asshole.
Two come to mind:
Wilhelm Reich: was originally a respected psychologist. totally went bonkers later. Hos “orgone” theory is one of the amusing episodes of crackpot “science”.
-L. Ron Hubbard: Scientist, naval officer, and researcher. His theory of “scientology” is a real hoot-postulates that human souls/thetans have existed for 100’s of billions of years.