Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. In an older and closely related meaning (found, for example, in Aristotle), "science" refers to the body of reliable knowledge itself, of the type that can be logically and rationally explained.
An instrument used for measuring angles primarily of celestial bodies like sun or a star...
Inventions & Discoveries > Scientific Instruments
A few years ago scientists discovered that these elementary particles are again made up of extremely small particles called quarks...
Physics > Atoms & Molecules