What is a protostar?
A) A contracting sphere of gas produced by the collapse of an interstellar cloud with,as yet,no nuclear reactions occurring in its interior
B) A shell of gas left behind from the explosion of a star as a supernova
C) A small,cold,interstellar cloud before it collapses to become a star
D) A star near the end of its life,just before it explodes as a supernova

Question

Quizplus · Accepted Answer

A protostar is a contracting sphere of gas produced by the collapse of an interstellar cloud with no nuclear reactions occurring in its interior yet. As it continues to contract, eventually the central temperature and pressure will become high enough to ignite nuclear fusion, and it will become a star.

What Is a Protostar