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The huge solar panels are shown in yellow-checkered blue at left and partly obscured at right. Looking inside the aft bay of the vehicle, we can see key components of each of the science instruments—the spectrometers are shown in copper and blue (in the foreground), the cameras in pink, green and lavender (mostly in the background). (Insets A, B, C, and D) The four small insets are computer-rendered views of Hubble in orbit. Despite having the size of a city bus, Hubble is designed to move in space with the grace of a prima ballerina.

Spectra like these, which tell astronomers virtually all that we know about stars, are the subject of this chapter. LEARNING GOALS Studying this chapter will enable you to: Describe the characteristics of continuous, emission, and absorption spectra and the conditions under which each is produced. Explain the relation between emission and absorption lines and what we can learn from these lines. Discuss the observations that led scientists to conclude that light has particle as well as wave properties.

Atom Building block of matter, composed of positively charged protons and neutral neutrons in the nucleus, surrounded by negatively charged electrons. aurora Event which occurs when atmospheric molecules are excited by incoming charged particles from the solar wind, then emit energy as they fall back to their ground states. Aurorae generally occur at high latitudes, near the north and south magnetic poles. autumnal equinox Date on which the Sun crosses the celestial equator moving southward, occurring on or near September 22.

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Astronomy Today Chaisson McMillan, Prentice-Hall, Inc.

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