Galileo's observations of Jupiter and its moons showed that these objects were orbiting the planet, which provided evidence for the idea that not everything in the universe revolved around the Earth. Galileo's observations of these moons showed that they were moving in regular, predictable patterns, which suggested that they were being influenced by the gravitational pull of Jupiter. This observation provided strong evidence for the idea that the planets revolved around the Sun, rather than the Earth, and supported the Copernican Theory.