July 15, 2017

Download Astronomy Today Chaisson McMillan, Prentice-Hall, Inc. PDF

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Additional resources for Astronomy Today Chaisson McMillan, Prentice-Hall, Inc.

Example text

LEARNING GOALS Studying this chapter will enable you to: Discuss the nature of electromagnetic radiation, and tell how that radiation transfers energy and information through interstellar space. List the major regions of the electromagnetic spectrum and explain how the properties of Earth's atmosphere affect our ability to make astronomical observations at different wavelengths. Explain what is meant by the term "blackbody radiation" and describe the basic properties of such radiation. Tell how we can determine the temperature of an object by observing the radiation that it emits.

Here some of the fine structure in the shell of gas can be seen more clearly. (Inset C) Contour images, like this one derived from red light emitted by hydrogen gas in the nebula's shell and star's lingering atmosphere, can be used to map regions of relative brightness. LEARNING GOALS Studying this chapter will enable you to: Discuss the nature of electromagnetic radiation, and tell how that radiation transfers energy and information through interstellar space. List the major regions of the electromagnetic spectrum and explain how the properties of Earth's atmosphere affect our ability to make astronomical observations at different wavelengths.

However, in 13,000 years' time, Orion will be a summer constellation. HTM (8 of 8) [14/12/2002 2:33:37] Chapter 1, Section 4 The Moon is our nearest neighbor in space. Apart from the Sun, it is by far the brightest object in the sky. Like the Sun, the Moon appears to move relative to the background stars. Unlike the Sun, however, the Moon really does revolve around the Earth. It crosses the sky at a rate of about 12° per day, which means it moves an angular distance equal to its own diameter—30 arc minutes—in about an hour.

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