the point i was trying to make is that a post high school education is not a requirement to be a scientist.
In the last century or so, possession of an earned doctorate has kind of become an employment requirement for researchers in academic, government and corporate laboratories. It's part of the on-going institutionalization of science.
This, btw, is part of the reason why so much of the general public finds science, if not boring, at least alien and intimidating. It's just too far removed from where most people find themselves in life. To even get a foot in the door of institutionalized science, an interested layperson would have to devote something like ten years to often grueling university preparation.
there have been many people who have made a valuable contribution to science without one.
this, by no means, is saying a formal education is worthless.
Prior to the 19th century, the Ph.D. degree awarded on the basis of a research dissertation didn't exist. Many universities didn't even have science departments and didn't award degrees in the subject. Most university graduates were satisfied with bachelors degrees and these were typically in liberal arts subjects like history or classics.
The 18th and prior centuries were the great age of amateurism in science. It was actually stylish for educated laypeople to conduct experiments. We see that with people like Benjamin Franklin. After dinner, families would clear away the dirty plates and pull out prisms and pendulums. Wealthy landowners would construct telescopes in their backyards and observe the heavens. If young people were really serious about studying science professionally, they would find a prominent researcher in their field and apprentice themselves to him.
So yeah, many of the iconic names in the earlier centuries of science would be considered amateurs by todays' standards.
I guess that even today, their descendants still exist, in the form of amateur astronomers, naturalists and geologists. Amateurs still produce some valuable work, counting birds in wildlife refuges or discovering new comets.