Conversations on the Plurality of Worlds
It offered an explanation of the heliocentric model of the Universe , suggested by Nicolaus Copernicus in his 1543 work "De revolutionibus orbium coelestium" . 
<triplet> Nicolaus Copernicus <subj> De revolutionibus orbium coelestium <obj> notable work <triplet> De revolutionibus orbium coelestium <subj> heliocentric <obj> main subject <subj> Nicolaus Copernicus <obj> author <subj> 1543 <obj> publication date