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A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

The plural of 'experience' or 'experiment'. It refers to practical contact with and observation of facts or events, or scientific tests.

In biology, a group of cells with similar structure and function. In general contexts, the texture or structure of a material or society.

The action of becoming larger or wider; expansion.

The act of revealing, discovering, or uncovering something that was hidden or unknown.

Correct in all details; exact or precise.

Human beings collectively; mankind. It is often used in scientific or historical contexts to distinguish humans from other species.

A particular space, area, or domain within which something exists or operates. It can be physical space or a metaphorical scope.

The systems or processes by which something takes place or is brought about. Often used to describe biological or mechanical processes.

A proposed explanation or starting point for further investigation, used extensively in scientific research and academic writing.