Most of the planets and their moons rotate in the same direction.
Earth is layered, with densest material in the core, lower density material in the crust.
Isotopic ages of meteorites and moon cluster around 4.55 billion years. Elememental abundances on earth differ from cosmic abundances of elements. As atomic number increases, elemental abundance in the universe decreases exponentially. Elemental composition of Sun is nearly identical to cosmic abundance. Therefore, Sun formed from remnants of a supernova, the collapse and explosion of a huge star.