Views of the Solar System. The density of the Earth is higher than that of any other planet.
Sources vary when it comes to the density of the Earth.
All the numbers that were provided are so close to each other, however, that they can each be considered valid. Cavendish assembled an apparatus that consisted of a suspended metal rod with two lead balls hanging from it. He placed masses of metal near these balls in order to measure the force of attraction between them. Correspondingly, he could then find the attraction on a mass the size of the Earth and then determine its density. This famous procedure is known as the Cavendish Experiment.