Why did copernicus not tell anyone about his theory until his deathbed?

opernicus did not receive his medical degree from Padua; the degree would ... on 24 May 1543 Copernicus held a copy of the finished work on his deathbed. Thus, Copernicus probably adopted the heliocentric theory ...

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explanation:

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".