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Explorations an Introduction to Astronomy Thomas T. Arny | ||||||||
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Chapter
Images
Chapter 15, Figure 17
Figure
15.17
(A), (B),
(C) Emission nebulas. (Courtesy Anglo Australian Observatory; photographs
by David Malin.) Notice the bright (and hot) stars near the glowing gas. (D)
These stars emit ultraviolet radiation, which heats and ionizes the nearby
hydrogen gas. Electrons dropping from orbit 3 to orbit 2 generate the red
light.
