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Ch 25: Characteristics of Galaxies: Help and Review

About This Chapter

The Characteristics of Galaxies chapter of this Intro to Astronomy Help and Review course is the simplest way to master the properties of galaxies. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essential characteristics of galaxies.

Who's it for?

Anyone who needs help learning or mastering introductory astronomy material will benefit from taking this course. There is no faster or easier way to learn about introductory astronomy. Among those who would benefit are:

  • Students who have fallen behind in understanding the types and characteristics of galaxies
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about the characteristics of galaxies
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the Characteristics of Galaxies chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Characteristics of Galaxies chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any question about the characteristics of galaxies. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in a galaxies unit of a standard introductory astronomy course. Topics covered include:

  • The Hubble tuning fork
  • Spiral galaxies
  • Dark matter
  • Quasars
  • Black holes

16 Lessons in Chapter 25: Characteristics of Galaxies: Help and Review
Test your knowledge with a 30-question chapter practice test
Links in the Cosmic Distance Ladder

1. Links in the Cosmic Distance Ladder

This lesson goes over the important basics regarding the cosmic distance ladder and primary, secondary, and tertiary indicators. It will also define standard candles and parallax.

The Distribution of Galaxy Properties Along the Hubble Tuning Fork

2. The Distribution of Galaxy Properties Along the Hubble Tuning Fork

This lesson will explore Edwin Hubble's famous classification scheme. We'll go over the major morphological differences between the categories of galaxies and the differences within them.

Types of Spiral Galaxies

3. Types of Spiral Galaxies

Spiral galaxies are classified into several different types, depending on the characteristics of certain parts of their galaxy. Specifically, this lesson will go over Hubble's classification scheme of spiral galaxies with a small nod to lenticular galaxies as well.

The Collision & Assembly of Galaxies

4. The Collision & Assembly of Galaxies

This lesson will talk about how the assembly and collision of galaxies is actually related, what starbursts are, what will happen to our own galaxy in four billion years, and why our galaxy is a galactic cannibal!

Measuring the Properties of Distant Galaxies

5. Measuring the Properties of Distant Galaxies

This lesson will go over a couple of methods astronomers use to find out the properties of a distant galaxy, namely, its distance away from us and its mass.

Characteristics of Stars' Orbits in the Galaxy

6. Characteristics of Stars' Orbits in the Galaxy

This lesson will explore the spherical component and disk of the galaxy to find out what orbital tendencies stars and star clusters have within each section of the Milky Way Galaxy.

What Are the Different Types of Galaxy Clusters?

7. 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.

Hubble's Law & Hubble's Constant

8. Hubble's Law & Hubble's Constant

This lesson will go over and define the Hubble Law and Hubble constant. We'll not only do a practice problem but also define conceptually what these two things mean to our cosmos.

Dark Matter & Gravitational Lensing

9. Dark Matter & Gravitational Lensing

This lesson will describe what dark matter is, how much of a cluster of galaxies is made of it, where it's located, and how all of this is related to gravitational lensing.

What Are Quasars?

10. 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.

What are Active Galactic Nuclei?

11. What are Active Galactic Nuclei?

This lesson explores and defines active galaxies and active galactic nuclei. You'll learn how they relate to quasars and how big active galactic nuclei are thanks to the observations of the properties of light.

What Are Supermassive Black Holes?

12. What Are Supermassive Black Holes?

This lesson will explain to you what a supermassive black hole is, where they're found, how large they are, how they likely formed, and what they emit into space.

Galaxy Collisions: Ring & Elliptical Galaxies

13. Galaxy Collisions: Ring & Elliptical Galaxies

This lesson will discuss the collisions between galaxies and what happens to the stars within them. It will also cover what a ring galaxy is and how it forms, as well as where elliptical galaxies are most common.

Seyfert Galaxies & Double-Lobed Radio Galaxies

14. Seyfert Galaxies & Double-Lobed Radio Galaxies

This lesson will cover two particular kinds of active galaxies called Seyfert galaxies and double-lobed radio galaxies and their peculiarities, such as hot spots and synchrotron radiation.

Active Galactic Nuclei & the Unified Model

15. Active Galactic Nuclei & the Unified Model

This lesson will explain the unified model, a model developed by astronomers that tries to help explain how it is that supposedly different objects are really the same thing viewed from different angles.

Elliptical Galaxy: Definition & Examples

16. Elliptical Galaxy: Definition & Examples

In this lesson, you will learn about one of the main types of galaxies found in the universe and how to identify elliptical galaxies based on their defining characteristics.

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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