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Explorations an Introduction to Astronomy Thomas T. Arny | ||||||||
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Chapter
Images
Chapter 12, Figure 11
Figure
12.11
Measuring
a star's radial velocity from its Doppler shift. (a) Spectrum lines from a star moving away from Earth are shifted
to longer wavelengths (a red shift). Spectrum lines from a star approaching
Earth are shifted to shorter wavelengths (a blue shift). (b) A standard lamp attached inside the
telescope serves as a comparison spectrum to allow the wavelength shift of
the star's light to be found.
