Simple Description

Early stage in star life cycle before the process of fusion begins.

Further Detail

An early stage in a star life cycle. This stage happens when a part of a nebula is starting to become be pulled together by gravity to become dense enough to start the process of fusion. Gravity will continue to pull more matter into the star even once fusion has begun. When this accumilation stops, it will become a main sequence star.

Related Words:

• Nebula
• Main Sequence

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