Anyone can have an idea about how nature works. Some people think their idea is correct because "it seems right" or "it makes sense." But for a scientist (who could be you!), this is not enough. A scientist will test the idea in the real world. An idea that predicts how the world works is called a hypothesis.
Hmmm. Is my hypothesis correct?
If an idea, or hypothesis, correctly predicts how something will behave, we call it a theory. If an idea explains all the facts, or evidence, that we have found, we also call it a theory.
"Scientific method" usually means a series of steps that scientists follow to discover how nature works.
These steps will work fine for a school science fair project. But this is not usually the way science actually happens!Physical science is concerned with the study of natural but non-living objects, while life science is the scientific study of living organisms. ... Chemistry is also a physical science, and could be seen as a bridge between physical and life sciences.Physical science, the systematic study of the inorganic world, as distinct from the study of the organic world, which is the province of biological science. Physical science is ordinarily thought of as consisting of four broad areas: astronomy, physics, chemistry, and the Earth sciences. Each of these is in turn divided into fields and subfields. This article discusses the historical development—with due attention to the scope, principal concerns, and methods—of the first three of these areas. The Earth sciences are discussed in a separate article.
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