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Observing the Spectrum of M31
You have elected to observe the spectrum of M31, and compare the locations
of spectral lines to those of hydrogen and calcium as seen in a
laboratory. Spectra are especially powerful tools in astronomy, and contain
much useful information about their sources! Below is the spectrum of M31.
The locations of lab spectra of calcium K and hydrogen lines are also
indicated in black. The corresponding calcium and hydrogen lines from M31
can be seen in absorption. Look carefully in making your
comparison. You may find it easier to click on the image, print it, and estimate
the Doppler shifted wavelengths using a ruler.
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