Definition

A cloud of gas and dust in space that is forming into a star and has not yet started nuclear fusion.

Example

Astronomers study protostars to understand how stars are born.

Conversation

Did you know that a protostar is the first step in star formation?

Really? I had no idea what that was.

Yeah, it's basically a cloud of gas and dust that eventually becomes a star.

That sounds fascinating! Space is so full of mysteries.

Synonyms & Antonyms

Root Explanation

Protostar → It is formed from "proto-" (from Greek "protos", meaning first) and "star" (from Old English "steorra", meaning celestial body). The word "protostar" refers to the first stage in the formation of a star, indicating it is the initial form before becoming a fully developed star.

Memory Tip

Think of 'proto-' meaning 'first' and 'star' as a celestial body — a protostar is the first stage in the life of a star.

Visually Confused Words