Ch 50: Praxis Biology & General Science: Stars & the Sun

About This Chapter

Use this chapter on astronomy to prepare for the Praxis II Biology and General Science exam. The video lessons and quizzes cover evidence supporting the Big Bang Theory, the stages of a star's life cycle and other topics included on the exam's Earth and Space Science section.

Praxis II Biology & General Science: Astronomy I - Chapter Summary

A small portion of Praxis II Biology and General Science exam questions are designed to test your familiarity with star life cycles and galaxy types. If you need a resource to help you brush up on these subject areas, this chapter's video lessons covers the astronomy topics listed below:

  • Origins of the universe
  • Star formation and star types
  • Galaxy formation
  • The sun's structure and life cycle
  • Life cycles of neutron stars, supernovas and supergiant stars
  • Types of telescopes

Video lessons are taught by experienced instructors whose teaching styles make the content approachable and easy to understand. There are also corresponding transcripts you can use to quickly review key terminology and main ideas. When you're ready to assess your grasp of the material, there are self-assessment quizzes you can take as many times as you need.

Praxis II Biology and General Science: Astronomy I Course Objectives

The Praxis II Biology and General Science exam is used by some states' teacher licensing boards to assess the subject area knowledge of prospective high school biology and general science teachers. You'll have two hours to answer 120 multiple-choice questions, ten percent of which cover earth and space science.

You can use this chapter's quizzes and video lessons to prepare for this part of the exam, which might require you to select the appropriate responses to questions about star properties, the origin of the universe or relationships between the Earth, moon and sun.

10 Lessons in Chapter 50: Praxis Biology & General Science: Stars & the Sun
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.

Star Formation: Main Sequence, Dwarf & Giant Stars

3. Star Formation: Main Sequence, Dwarf & Giant Stars

Learn how stars are born, beginning with a protostar. Then learn about stars in later stages of life, including main sequence stars, brown dwarfs, red giants, and black holes.

Types of Telescopes: Radio, Reflecting & Refracting Telescopes

4. 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.

Galaxy Formation: Spiral, Elliptical & Irregular Galaxies

5. 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.

Types of Stars by Size, Color and Life Cycle

6. 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.

Structure of the Sun

7. 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.

Stages of the Sun's Life Cycle

8. Stages of the Sun's Life Cycle

Discover our sun, the provider of energy for life on Earth. Learn how the sun was born, how it lives as a main sequence star, how it will age into a red giant and how it will die as a white dwarf.

Life Cycle of Neutron Stars

9. Life Cycle of Neutron Stars

Discover the life of a neutron star, including how it's born after a supernova explosion and how its extreme pressure causes protons and electrons to combine into neutrons. Discover also how pulsars are rotating neutron stars that will eventually slow down to become regular neutron stars.

Supernova and Supergiant Star Life Cycle

10. Supernova and Supergiant Star Life Cycle

Learn about one of the biggest explosions known to humankind - a supernova. Follow a star's life cycle and learn how a star changes from a red giant to a supernova to a black hole or neutron star.

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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