Hypothesis
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A hypothesis is a proposed explanation for a phenomenon. A scientific hypothesis must be based on observations and make a testable and reproducible prediction about reality, in a process beginning wit
The hypothesis of Andreas Cellarius, showing the planetary motions in eccentric and epicyclical orbits
Scientific theory
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A scientific theory is an explanation of an aspect of the natural world that can be or that has been repeatedly tested and has corroborating evidence in accordance with the scientific method, using ac
Hypothesis
…reality, in a process beginning with an educated guess. If a hypothesis is repeatedly independently demonstrated by experiment to be true, it becomes a scientific theory. In colloquial usage, the words hypothesis and theory are often used interchangeably, but this is incorrect in the context of science. A working…
The first observation of cells, by Robert Hooke, using an early microscope. This led to the development of cell theory.