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What does the 'family tree' of stars look like?
Not all of the stars in the Universe are the same – differences in brightness and colour can be recognised even with the naked eye. In the 19th century, star spectroscopy developed into an important method of analysis in astronomy. With its aid, astronomers were able to divide the stars into what are known as spectral classes.
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Last update: 09/11/2009 10:04:02