ProDeoEtVeritate said:
Okay, then help me understand. From what I understand a scientist will have a hypothesis (sp?) to which he/she looks for evidence to support it. When he/she as some evidence it becomes a theory. When the theory is proven without a shadow of doubt then it becomes understood as a law of science. Is this correct? If not please define what hypothesis, theory and laws in the scientific world.
No. A scientist does not begin with a hypothesis. A scientist begins with an observation or a set of observations which raise a question. E.G. when it was observed that all distant galaxies were red-shifting, it was natural to wonder why. Why are all distant galaxies moving away from us and not a single one toward us?
A hypothesis is proposed to answer that question. In the example above, the hypthesis is that the universe is expanding. Next the scientists work out the logical consequences of the hypothesis, paying particular attention to those that can be tested.
One of the logical consequences of an expanding universe is that it used to be smaller. And that the expansion had to have a beginning. This would mean that the universe must have had a beginnning.
This was a new thought for scientists, as for millennia, scientists and philosophers had found that apart from the revelation of creation, all evidence pointed to the universe being eternal. In short, only Judaeo-Christian belief told us that the universe had a beginning in creation. There was no evidence in nature that the universe had not always simply been there. So they looked for something in the hypothesis that could be tested.
Now here is an important principle of modern science. The purpose of testing is not to find evidence which supports the hypothesis, but evidence which shows that the hypothesis is false. If a test can show that a hypothesis is false, then it can be trashed. If it does not show that a hypothesis is false, then science will keep working with it.
So we have
1) observation which raises a question
2) a hypothetical answer to the question
3) new observations which must be true if the hypothesis is correct. These observations may not have been made yet; at this stage they only need to be necessary logical consequences of the hypothesis.
4) a way to test for the predicted observations
Then, when possible, the test is run. If the observations are not as predicted, one of two things will happen. If it is possible to revise the hypothesis and try again, that is the preferred response. If it is not possible to revise the hypothesis, it never makes it to becoming a theory.
The aim is to get a well-tested hypothesis, which successfully predicts additional observations and is not falsified by existing evidence. A hypothesis which has been repeatedly tested many times in many ways is considered a well-established theory.
A theory often includes laws. In the example above, there was one principal observation--the red-shifting of distant galaxies. But there was an important secondary observation: the more distant the galaxy, the deeper the red shift. This indicates that not only are distant galaxies moving away from us, but the farther away they are, the faster they are moving. This is a relationship which can be expressed as a mathematical formula. When we have a set of observations that can be summarized in such a (usually mathematical) formula, that is called a scientific law. The existence of regularities in nature which can be summarized in laws is itself an observation which raises the question of what causes this regularity. So a law can become the subject of a hypothesis and predictions and tests and eventually a theory, just as single observations can be.
Developing theories which explain accurately how the world of nature works is the chief business of science. In science, a good theory is the pinnacle of scientific achievement.