About This Chapter
Structure of the Milky Way Galaxy - Chapter Summary
Let this chapter's lessons help you review facts about the structure of galaxies, with a focus on our Milky Way. See how the Milky Way galaxy is shaped, examine its spiral arms, and see what is at the nucleus of a galaxy. You'll brush up on types of stars, the mass of the galaxy, and examine what Hubble's law and Hubble's constant have to say about deep space. Viewing these lessons should enable you to:
- Describe spiral, elliptical and irregular galaxies
- Explain theories on how the Milky Way formed
- Outline the Milky Way's structure
- Explore what is at the nucleus of a galaxy
- Describe population I and population II stars
- Report on the galaxy's mass
- Use Hubble's law and Hubble's constant to understand the Milky Way
These lessons go over topics you may have studied in high school or college, and may offer some new information, too. Our instructors have created lessons and quizzes that make studying enjoyable. If you have any questions, you can contact the instructor for some personalized help.
1. 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.
2. 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.
3. 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.
4. The Nucleus of a Galaxy
This lesson will explore our galaxy's nucleus. Namely, we will find out how we can peer inside using radio waves and infrared, and what that and X-rays tell us about the cool thing that's located inside of it.
5. The Spiral Arms of the Milky Way Galaxy
How do we know our galaxy has spiral arms? You can't really see them, but we can infer they're there thanks to radio waves and observations of other galaxies, which you will learn about in this lesson.
6. Population I and Population II Stars
This lesson will explore the different populations of stars in our galaxy, including population I and II stars, as well as where you can find them and what metals are to an astronomer.
7. The Mass of Our Galaxy
This lessons explores the estimates and numbers surrounding the mass of the Milky Way Galaxy and how they relate to Keplerian motion, the galactic corona, and dark matter.
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.
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Other chapters within the AEPA Earth Science (AZ045): Practice & Study Guide course
- Development of Earth & Space Science
- Nature of Scientific Inquiry
- Scientific Data & Calculations
- Maps & Spatial Concepts
- Space Science Technology
- Laboratory Safety & Procedures
- Earth's Formation & Structure
- Plate Tectonics, Continental Drift & Ocean Formations
- Time & Dating in Geology
- Weathering, Erosion & Deposition
- Physical & Chemical Properties of Earth's Minerals
- Rocks & Minerals
- Understanding Earthquakes
- Biogeochemical Cycles
- Earth's Hydrologic Cycle
- Earth's Fresh Water
- Atmospheric Structure & Energy Transfer
- The Ozone Layer, Climate Change & Air Pollution
- Season & Climate Classifications
- Earth's Climate System: Wind, Air Masses & El Nino
- Weather Conditions & Severe Weather Phenomena
- Weather Forecasting and Analysis
- Characteristics of Ocean Water, Currents & Waves
- The Earth & the Moon
- The Sun's Structure, Energy & Life Cycle
- Celestial Orbit Characteristics
- Solar Radiation, Energy & Electromagnetic Waves
- Formation of the Solar System
- Celestial Bodies of the Solar System
- Kepler & Newton's Laws of Motion
- Star Types and Significance
- Characteristics of Stars
- The Universe: Key Concepts & Theories
- AEPA Earth Science Flashcards