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Ch 20: Chapter 20: The Universe - Holt Physical Science With Earth & Space Science

About This Chapter

The Universe chapter of this Holt Science Spectrum - Physical Science with Earth and Space Science Companion Course helps students learn the essential lessons associated with the universe. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with The Universe textbook chapter.

How It Works

  • Identify the lessons in the Holt The Universe chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the universe topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Chapter Topics

You'll learn all of the physical science topics covered in the textbook chapter, including:

  • Facts about stars, white dwarfs, black holes and red giants
  • Astronomical terms used to describe ways in which distance is measured
  • Solar flares, sunspots and the layers of the sun
  • How supernovas are created
  • Types of galaxy clusters
  • How galaxies form
  • Hypotheses of the formation of the Milky Way
  • The definition of quasars
  • The differences between solar system, galaxy and universe
  • Ideas about the origins of the universe

Holt is a registered trademark of Houghton Mifflin Harcourt., which is not affiliated with Study.com.

15 Lessons in Chapter 20: Chapter 20: The Universe - Holt Physical Science With Earth & Space Science
Test your knowledge with a 30-question chapter practice test
Stars as a Source of Light: Definition & Explanation

1. Stars as a Source of Light: Definition & Explanation

After reviewing this lesson, you will be able to explain how stars are a source of light, and why we see other objects in our solar system. A short quiz will follow.

Astronomical Units & Light Years: Definition & Examples

2. Astronomical Units & Light Years: Definition & Examples

After watching this video, you will be able to explain why we need special astronomical ways of measuring distance. You will also be able to state the meaning of the terms astronomical unit, light year and parsec. A short quiz will follow.

Types of Telescopes: Radio, Reflecting & Refracting Telescopes

3. Types of Telescopes: Radio, Reflecting & Refracting Telescopes

Learn about the different types of telescopes that astronomers use: X-ray, radio, gamma ray, reflecting and refracting. Learn what the differences are between them and what different things they show us about the universe.

Structure of the Sun

4. Structure of the Sun

Discover the layers of the sun, including the core, radiative zone, convective zone, photosphere, chromosphere, and corona. Find out which layers you can see from Earth. Investigate what sunspots and solar flares are.

Red Giant, Horizontal & Asymptotic Giant Branch Stars

5. Red Giant, Horizontal & Asymptotic Giant Branch Stars

This lesson will outline how stars of low to intermediate mass die as seen on the H-R diagram. We'll cover important key terms such as red giant branch stars, asymptotic branch stars, and horizontal branch stars.

What Are White Dwarfs? - Stellar Remnant Characteristics

6. What Are White Dwarfs? - Stellar Remnant Characteristics

White dwarfs are incredible little stellar remnants. Which begs the question, are they actually stars or not? This lesson will tell you if and why and how white dwarfs come to be. That, and you'll learns some incredible facts about them as well.

Supernova: How Massive Stars Explode

7. Supernova: How Massive Stars Explode

This lesson will explain how it is that a supernova comes to be by delving into how concepts like iron, core contraction, a core bounce, the strong force, and neutrinos all play a role in this event.

Life Cycle of Black Holes

8. 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.

Solar System, Galaxy, & Universe: Definitions & Difference

9. Solar System, Galaxy, & Universe: Definitions & Difference

Want to learn what the universe, galaxy, and solar system are as well as some cool facts about each one? This lesson will give you an overview of what these three things are in a relatable fashion.

What Are the Different Types of Galaxy Clusters?

10. What Are the Different Types of Galaxy Clusters?

This lesson will define five different types of clusters: rich, poor, irregular, regular, and superclusters. We'll also find out what voids are and what the Local Group is.

Galaxy Formation: Spiral, Elliptical & Irregular Galaxies

11. Galaxy Formation: Spiral, Elliptical & Irregular Galaxies

This lesson explains how galaxies form, starting with the Big Bang. You'll also learn about the solar nebula hypothesis and three galaxy types, including spiral, elliptical, and irregular galaxies.

The Formation of the Milky Way Galaxy

12. The Formation of the Milky Way Galaxy

This lesson will explore two hypotheses as to how the Milky Way galaxy formed. These are the top-down and bottom-up hypotheses. We'll also go into what special connection you personally have to all of this.

The Structure of Our Galaxy

13. The Structure of Our Galaxy

If you ever looked up at the night sky far away from city lights, you would've seen a band of light across the night sky and lots of stars scattered around the rest of the sky. Why? The structure of our galaxy will explain exactly why.

What Are Quasars?

14. What Are Quasars?

This lesson will go over the odd-sounding term quasar. You'll learn how the term appeared, the different kinds of quasars, and what they are actually believed to be.

Origins of the Universe: The Big Bang and Expanding & Contracting Universes

15. Origins of the Universe: The Big Bang and Expanding & Contracting Universes

Students will learn the origins of the universe, the Big Bang theory, the timeline of the universe, how the universe is still expanding to this day, and what astronomers expect the universe to look like in the future.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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