Ch 48: Praxis General Science: Astronomy

About This Chapter

When you take the Praxis General Science examination, you'll require an extensive understanding of astronomy. In order to help you reach expert status, this chapter includes educational lessons on astronomy that include evaluative quizzes.

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.

15 Lessons in Chapter 48: Praxis General Science: Astronomy
Test your knowledge with a 30-question chapter practice test
Origins of the Universe: The Big Bang and Expanding & Contracting Universes

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.

Evidence for the Big Bang Theory: Background Radiation, Red-Shift and Expansion

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.

Types of Stars by Size, Color and Life Cycle

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.

Galaxy Formation: Spiral, Elliptical & Irregular Galaxies

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.

The Sun: Structure & Life Cycle

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!

Life Cycle of Black Holes

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.

Inner Planets of the Solar System: Mercury, Venus, Earth & Mars

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.

Formation of the Earth: Theories

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.

Formation of the Moon: Theories

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.

Planetary Predictors of Extraterrestrial Life

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.

Outer Planets of the Solar System: Jupiter, Saturn, Uranus, Neptune

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.

Dwarf Planets of the Solar System: Pluto, Eris, Haumea & Ceres

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.

Asteroids, Meteorites & Comets: Definitions and Characteristics

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.

Dark Matter & Gravitational Lensing

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.

Types of Telescopes: Radio, Reflecting & Refracting Telescopes

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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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