Question

which of these thinkers from the scientific revolution first proposed a heliocentric theory — that earth revolves around the sun?
a. nicolaus copernicus
b. robert boyle
c. isaac newton
d. galileo galilei

Explanation:

Nicolaus Copernicus first proposed the heliocentric theory in his work "On the Revolutions of the Heavenly Spheres", challenging the geocentric view. Robert Boyle is known for Boyle's law in chemistry, Isaac Newton for laws of motion and universal gravitation, and Galileo Galilei for his support and further evidence - gathering for the heliocentric model but not for its initial proposal.

Answer:

A. Nicolaus Copernicus