Cambridge O Level Physics · Syllabus 5054 · Space Physics
Protostar
What is Protostar?
A protostar is an interstellar cloud of gas and dust that is collapsing and increasing in temperature as a result of its own internal gravitational attraction. It is not yet a stable star.
This definition is part of the Space Physics chapter in Cambridge O Level Physics.
Last reviewed Syllabus 2026-2028

