How did copernicus's work challenge the accepted view of the universe ?

Nicolaus Copernicus was a Polish astronomer monk of the Renaissance who formulated the heliocentric theory of the solar system, conceived in the first instance by Aristarchus of Samos. His book "On the revolutions of the celestial spheres" is usually considered the starting point of modern astronomy, as well as being a key piece in what was called the Scientific Revolution at the time of the Renaissance. Copernicus spent about twenty-five years working on the development of his heliocentric model of the universe. At that time it was difficult for scientists to accept it, since it was a real revolution.

the awenser wuold be slaves

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.