freediver wrote on Jun 17
th, 2008 at 11:41am:
It doesn't meant that it's non factual.
But it isn't factual. Scientists deliberatley avoid using the term fact, because their theories and laws are wrong. This is why I think philosophy is such an important subject.
Sure, scientitsts deliberately avoid the use of the term fact. In science knowledge is never static. As technology improves they are finding out new things all the time and the theories get modified.
Dark matter was put forth by by Fritz Zwicky in 1933. He couldn't conclusively prove its existance and has remain a hypothesis since then. However, scientific technology has enabled scientist to provide further corrobarating hypotheses that dark matter could exist. It is not taught as fact. It will always be refered to as a hypothesis until proven otherwise.
Nicholaus Copernicus was working on his hypothesis "De revolutionibus orbium coelestium" as an alternative to the Ptolemaic system. When other scientists can corrobarate his hypothesis it became a theory - that the sun does not revolve around the earth; but that the planets orbit the sun.
Pythagoras first hypothesis that all celestial bodies are spherical in 600 BCE. Aristotel provived observational evidence to that hypothesis in 330 BCE. Erastosthene calculated the earths circunferance in 240 BCE. Geographer Strabo suggested in 10 BCE that the earth was spherical by observing and measuring the horizon which he noted had a circumferance. Chinese philosopher and astronmer Xu Yi summised in 330 CE that all clestial bodies are spherical by observing the moon and the various phases of lunar eclipses. With enough corrobarting evidence world wide over the centuries it became the accepted theory.
So how can theories be generally wrong? There are many theories I can cite for you, molecular theory, relavity theory, gravitational theory etc that forms the basis of theoretical physics (our world).