About This Chapter
Praxis General Science: Astronomy - Chapter Summary
This chapter covers topics that are related to astronomy, a subject in which you must have advanced knowledge if you're to pass the Praxis General Science examination. These video lessons will prepare you to answer questions about the formation of the moon and sun as well as the Earth and the galaxy. Study the Big Bang theory, examine various elements of the planets in our solar system and explore myths about black holes as you progress through the chapter. You may have studied sufficiently when you can:
- Explain the history of our universe
- Identify stars according to their size and color
- Describe the characteristics of spiral and elliptical galaxies
- Detail theories related to the formation of the sun and moon
- Teach students about planetary predictors of life outside our solar system
- Discuss asteroids, dark matter, comets and gravitational lensing
- List different kinds of telescopes and their uses
All of these lessons will contribute to your remembrance of the above topics or introduce you to new concepts. Presented by experienced teachers, the video lessons can be watched online with your mobile device or on a desktop computer. The chapter includes links to similar courses, and it will allow you to complete self-assessment quizzes at your leisure so you can be sure that you're prepared when answering pertinent questions on the Praxis General Science examination.
Praxis General Science: Astronomy Chapter Objectives
Worth 20% of the Praxis General Science examination score and containing 27 questions, the Earth and Space Science content category includes an Astronomy section. Here, you'll answer questions on the sun, moon and planets, and you'll display your expertise of dwarf planets, comets and meteoroids. There are 135 selected-response questions on the whole examination's five content categories. There's a 2.5-hour time limit on the computer-based assessment.
1. 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.
2. Evidence for the Big Bang Theory: Background Radiation, Red-Shift and Expansion
Discover what evidence exists to support the Big Bang theory of the birth of the universe. Learn how cosmic background radiation, the red shift of light and the ongoing expansion of the universe led scientists to believe that the universe was started with the Big Bang.
3. 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.
4. 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.
5. The Sun: Structure & Life Cycle
Learn some secrets of our star, the sun, and discover what's inside of it. Learn about the history and future of the sun, then test your new knowledge with a quiz!
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. Inner Planets of the Solar System: Mercury, Venus, Earth & Mars
Take a tour of the four inner planets: Mercury, Venus, Earth and Mars. Known as the terrestrial planets, find out what makes each of them unique and how they are different from the outer planets, the gas giants.
8. Formation of the Earth: Theories
In this lesson, the theory of how the planet Earth formed will be discussed. This includes looking at how it differentiated into three layers, how it formed its atmosphere, water, and land features, and how it continues to evolve today.
9. Formation of the Moon: Theories
Explore the four major theories on the formation of the Moon. The theories include the fission theory, capture theory, condensation theory and giant impact theory. Also look at both information supporting and flaws found in these theories.
10. Planetary Predictors of Extraterrestrial Life
Investigate what is needed for life to exist anywhere and the implications for life in our solar system beyond Earth. Consider Mars and some of the moons of Jupiter and Saturn, including Europa, Callisto, Ganymede and Enceladus.
11. Outer Planets of the Solar System: Jupiter, Saturn, Uranus, Neptune
Take a tour of the outer planets of our solar system: Jupiter, Saturn, Uranus, and Neptune. Find out what makes each of these gas giants unique and learn about Pluto, a dwarf planet.
12. Dwarf Planets of the Solar System: Pluto, Eris, Haumea & Ceres
Discover why Pluto had to leave the league of planets and was downgraded to a dwarf planet. Learn the definitions for planet and dwarf planet. Find out about the currently classified dwarf planets in our solar system: Pluto, Eris, Ceres, Haumea and Makemake.
13. Asteroids, Meteorites & Comets: Definitions and Characteristics
This lesson will cover the definitions and characteristics of asteroids, comets and meteorites. It will also explore what impact they have had on Earth and the impact they might have in the future.
14. 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.
15. 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.
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Other chapters within the Praxis General Science (5435): Practice & Study Guide course
- Praxis General Science: Methodology, Techniques & History
- Praxis General Science: Matter
- Praxis General Science: Energy
- Praxis General Science: Atomic Structure
- Praxis General Science: Radioactivity
- Praxis General Science: Thermodynamics
- Praxis General Science: Periodicity
- Praxis General Science: Gases
- Praxis General Science: Bonding & Structure
- Praxis General Science: Chemical Reactions
- Praxis General Science: Chemical Kinetics
- Praxis General Science: Chemical Reaction Equilibrium
- Praxis General Science: Oxidation Reduction
- Praxis General Science: Acid-Base Chemistry
- Praxis General Science: Solutions & Solubility
- Praxis General Science: Mechanics
- Praxis General Science: Newton's Laws & Motion in Physics
- Praxis General Science: Linear & Angular Momentum
- Praxis General Science: Oscillations
- Praxis General Science: Laws of Gravitation
- Praxis General Science: Work, Energy & Power
- Praxis General Science: Fluid Mechanics
- Praxis General Science: Magnetism & Electricity
- Praxis General Science: Electrical Forces & Fields
- Praxis General Science: Potential & Capacitance
- Praxis General Science: Optics & Waves
- Praxis General Science: Cell Biology
- Praxis General Science: Prokaryotic Cells
- Praxis General Science: Protists, Fungi & Viruses
- Praxis General Science: Plant Cells
- Praxis General Science: The Transcription & Translation Process
- Praxis General Science: Cell Reproduction & Division
- Praxis General Science: Basic Biochemistry of Life
- Praxis General Science: Basic Genetics
- Praxis General Science: DNA Replication
- Praxis General Science: Theory & Key Mechanisms of Evolution
- Praxis General Science: Hierarchical Classification Scheme
- Praxis General Science: Plant Structures & Functions
- Praxis General Science: Human Body Systems
- Praxis General Science: Human Reproductive Systems & Development
- Praxis General Science: Key Aspects of Ecology
- Praxis General Science: Minerals & Rocks
- Praxis General Science: Earth's Structure & Internal Processes
- Praxis General Science: Changing Earth's Surfaces
- Praxis General Science: Historical Geology
- Praxis General Science: Earth's Bodies of Water
- Praxis General Science: Meteorology & Climate
- Praxis General Science: Science, Technology & Society
- Praxis General Science Flashcards