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Explorations an Introduction to Astronomy Thomas T. Arny | ||||||||
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Chapter
Images
Chapter 15, Figure 18
Figure
15.18
Map of the
Milkyway made by combining radio observations
(since radio can penetrate dust and thereby allow one to see all the way across
the Milky ay's disk) and optical observations
of the position of HII regions. Such regions outline the spiral arms of other
galaxies. In our galaxy too they form a spiral pattern. (Courtesy Y. M. and
Y. P. Georgelin.)
