What research did Nicolaus Copernicus, Giordano Bruno and Galileo Galilei do? What conclusions did they come to?

Nicolaus Copernicus argued that the Earth is not stationary, but revolves around its axis. He also proclaimed that the Earth, along with other planets, revolves around the Sun.
Giordano Bruno defended the doctrine of the immensity, infinity and eternity of the universe. He proved that neither the Earth nor the Sun are the centers of the world.
Galileo Galilei scientifically proved the correctness of Copernicus’s heliocentric system with a telescope. The telescope allowed him to see that the Moon has an uneven surface, dotted with mountains and depressions. Variable dark spots were found on the surface of the sun. Galileo discovered four moons around the planet Jupiter that no one had seen before.

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