wasWas it when heliocentric model was spreading becausein the whole world? I saw a model of the solar system that was made in the 18th century where the sun was in the middle and the planets and comets around it and and the end it says firmamentsaid: "firmament of fixed stars, wasn'tstars". Wasn't at that time accepted that stars were suns or atleast not attached to any firmament and fixed?