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Explanation:

1. Stars form deep inside clouds of gas and dust. A cloud of gas and dust is a Nebula (plural - Nebulae). Star forming nebulae are cold, dense, and dark. Gravity causes the densest parts to collapse, forming regions called protostars.

2.Gravity

3.STAR FORMATION Star formation happens when part of a dust cloud begins to contract under its own gravitational force; as it collapses, the center becomes hotter and hotter until nuclear fusion begins in the core. ... Interstellar cloud starts to contract, probably triggered by shock or pressure wave from nearby star.

4.As the protostar gains mass, its core gets hotter and more dense. At some point, it will be hot enough and dense enough for hydrogen to start fusing into helium. It needs to be 15 million Kelvin in the core for fusion to begin. When the protostar starts fusing hydrogen, it enters the "main sequence" phase of its life.

5. Gas and Dust in Space, the most massive reservoirs of ... Close-up of the Orion Nebula in Infrared and Visible Light. ... the material in the neighborhood of the new stars is blown away into interstellar space. ... material, and a newly formed star, surrounded by a disk, becomes observable.

1. Stars form deep inside clouds of gas and dust. A cloud of gas and dust is a Nebula (plural - Nebulae). Star forming nebulae are cold, dense, and dark. Gravity causes the densest parts to collapse, forming regions called protostars.

2.Gravity

3.STAR FORMATION Star formation happens when part of a dust cloud begins to contract under its own gravitational force; as it collapses, the center becomes hotter and hotter until nuclear fusion begins in the core. ... Interstellar cloud starts to contract, probably triggered by shock or pressure wave from nearby star.

4.As the protostar gains mass, its core gets hotter and more dense. At some point, it will be hot enough and dense enough for hydrogen to start fusing into helium. It needs to be 15 million Kelvin in the core for fusion to begin. When the protostar starts fusing hydrogen, it enters the "main sequence" phase of its life.

5. Gas and Dust in Space, the most massive reservoirs of ... Close-up of the Orion Nebula in Infrared and Visible Light. ... the material in the neighborhood of the new stars is blown away into interstellar space. ... material, and a newly formed star, surrounded by a disk, becomes observable.

Explanation:

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