Quote:
Originally Posted by pwalker8
It all depends on what field of study we are talking about. In many fields of study, it's not truth but rather our understanding of what is true, i.e. theories. Many of the more popular science titles tend to discuss the current theories. Titles such as Sagan's Cosmo were tremendously popular at the time, but our understanding of the subject has changed quite a bit since that book came out.
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Sagan's field of expertise was planetary science - a field in which he could write knowledgeably and well. He fell down badly, though, when he expanded his literary endeavours into fields that he was not an expert in, such as biology.