Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 1Q
To determine

The complete formation process of the star.

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Explanation of Solution

Introduction:

The process through which thicker regions within molecular clouds in interstellar space collapse to form stars is referred to as star formation process. Stars represent the most basic bricks of galaxies. The formation and distribution of elements such as carbon, nitrogen, and oxygen are due to the stars.

The formation of a star can be understood by a study of the interstellar medium. The interstellar medium is mainly composed of 70% hydrogen by mass. The formation of clouds is in the dense regions of the interstellar medium. These molecular clouds are known as nebula where the stars are born.

At very low temperatures, the gases bind together to form molecules clouds. The cold regions inside molecular clouds also cause the gas to lump to high densities. When the desired density is achieved, stars form.

The formation of a star is due to the collapse of the cloud core in the denser region under their own weight/gravity. The centers are thicker than the outer cloud. So, they collapse first. As the core collapses, they fragment forms lumps. These lumps then combine to form into the protostar. A protostar continues to collapse to form star as long as the gravitational energy is balanced by the pressure due to the nuclear fusion reaction in the core.

Conclusion:

Therefore, the complete formation process of the star is studied in astronomy by observing and analyzing the behavior of interstellar medium and molecular clouds without even see the entire star formation process.

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