An expansion of the universe
Planets are formed like humans. The universe more or less makes love to itself to produce planets. Matter is the light. We are only in existence because of light. Matter expands like we do as humans as the result of gravity. Gravity accumulated matter and almost collects matter like dust. Why we exist in an expansion is because of the result of matter. The Earth is still being formed and you would imagine this is why the Earth circulates the Sun and spins. We only exist as an expansion of the universe.