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A star is called a what during the stage when it gives off heat and light for the first time.

User Oly
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Answer:

The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar. This is the first step in the evolution of a star. The glowing protostar continues to accumulate mass. ... Once its mass is stabilized, the star is known as a main sequence star.

User Wakeupneo
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