Revise GCSE Physics

Question:What evidence caused Copernicus and Galileo to develop newer models of the solar system?

Copernicus used observations of the motion of the planets to deduce that an improved model was needed because the Geocentric model did not correctly predict the motions that were observed.

Galileo was able to observe the Moons of Jupiter using early telescopes, so he knew that some celestial bodies did not orbit around the Earth, which disproved the Geocentric theory of the Universe.

Galileo also observed that Venus exhibited 'phases', the same as the moon, which would not have been possible with a geocentric arrangement and was a prediction of the Copernicus model.