About This Chapter
The Evolution of Stars - Chapter Summary
Whether you're looking for a refresher of the evolution of stars or want to fill gaps in your existing knowledge, this chapter can help! Engaging lessons offer a complete overview of stars, including how they are formed and classified. You can also get reacquainted with unique characteristics of stars. Once you've finished this chapter, you will be ready to do the following:
- Define and share important facts about stars
- List and describe types of stars by color, size and life cycle
- Explain how stars are born and discuss their subsequent stages of life
- Differentiate between a stellar association and star cluster
- Share the definition and a description of pulsars
- Outline the life cycle of a black hole and discuss black hole myths vs. reality
- Discuss the purpose of an H-R diagram
- Detail ways scientists determine the distance, age and relative motion of stars
This chapter offers a self-paced format that lets you take control of your studying process. Choose the lessons you want to review, visit as often as you'd like, and study any time your schedule permits. If you have questions about specific topics covered in the lessons, simply submit them to subject-matter experts using the Dashboard. When you're ready, utilize our self-assessment quizzes and practice exam to confirm your understanding of the evolution of stars.
1. Stars: Definition & Facts
Before you name a star after someone, get the facts! Stars are a lot more than pretty lights up in the sky. Complete this lesson to learn more about nuclear fusion, main sequence stars, red giants, and more.
2. Types of Stars by Size, Color and Life Cycle
Learn to identify the different sizes and colors of stars and how they relate to the star life cycle. In this lesson, we'll talk about spectral classification, how many stars there are of each type and the approximate color of the different classes of stars.
3. Star Formation: Main Sequence, Dwarf & Giant Stars
Learn how stars are born, beginning with a protostar. Then learn about stars in later stages of life, including main sequence stars, brown dwarfs, red giants, and black holes.
4. Young Stars & Stellar Associations
This lesson will describe the concept of a stellar association for you and how it differs from a star cluster. You'll also learn about the three general kinds of stellar associations: R associations, T associations, and OB associations.
5. What Are Pulsars?
This lesson will define and describe pulsars. Importantly, you'll learn why the term is a bit of a misnomer, what acts as a pulsar and why, and what it pulses out.
6. Life Cycle of Black Holes
Learn about black holes, their myths and their reality. Learn how black holes form after stars undergo supernovae and create singularities. Discover how big black holes grow, how scientists find black holes and where black holes are located in the universe.
7. H-R Diagram: Definition & Purpose
The Hertzsprung-Russell provides important information about stars such as color, temperature and luminosity. Check out which stars are blue, hot and red, and which ones are so cool they're in a class by themselves.
8. Determining the Age, Distance & Relative Motion of Stars
Even though we could never travel to a star in the sky to study it, astronomers still find ways to learn a lot about stars. In this lesson, you'll learn how they can find a star's age, distance, and relative motion to us.
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