# Ch 10: Measurement of Star Qualities

Watch online science video lessons to learn about star spectra, stellar parallax, nuclear fusion and other topics related to the measurement of star qualities.

## Measurement of Star Qualities - Chapter Summary and Learning Objectives

In this chapter, our instructors will show you how energy generated by the nuclear fusion occurring at a star's center determines its temperature, magnitude and luminosity. You can also discover the methods used by astronomers to study these qualities and determine the distance from Earth to other celestial objects. Lessons in this chapter are designed to teach you about the following:

• Methods for measuring the distance to stars
• Uses of a Hertzsprung-Russell diagram
• Star magnitude, brightness and luminosity
• Temperature classifications of star spectra
• Nuclear fusion and star equilibrium

Video Objectives
How to Find the Size of a Star Explain the relationship between the size, surface temperature and luminosity of a star. Learn to read a Hertzsprung-Russell (H-R) diagram.
Measuring the Distance to a Star Compare and contrast the triangulation methods used by surveyors with the parallax methods used by astronomers.
Using Stellar Parallax to Determine a Star's Distance Take a closer look at the parallax method for measuring the distance to stars. Learn how this measurement can be used to determine luminosity.
The Brightness Of Stars Differentiate between luminosity and intrinsic or apparent brightness. Relate subjective and objective measures of star brightness.
Relating a Star's Brightness to Luminosity Study the inverse square law to learn the relationship between star magnitude, luminosity and brightness.
Star Spectra: Classification Based on Temperature Explore the uses of the Balmer thermometer to chart a star's emission of hydrogen atoms and estimate its temperature.
How Stars Generate Energy Examine the nuclear fusion occurring at the center of a star. Learn how the processes of radiation and convection carry this energy outward.
The Spectral Sequence & Stellar Astronomy Get an introduction to the scientists who discovered spectral sequence.
Forces Keeping Stars in a Stable Equilibrium Explain how gravity and the outward forces generated by nuclear fusion maintain a star's equilibrium.
How to Draw a Hertzsprung-Russell Diagram Draw an H-R diagram and pinpoint the ranges of main sequence stars, white dwarfs, giants and supergiants.

16 Lessons in Chapter 10: Measurement of Star Qualities
Test your knowledge with a 30-question chapter practice test
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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