The Doctor turned to face her. His features were alive with wonder and excitement. Not for the first time, Rose felt it was as if he was seeing through her eyes, and she wondered if that was one of the reasons he needed somebody to travel with. ‘Rose, the moon is incredible. Everything down on Earth relies on it. Rats jump for it. Tides rush out from it. Humans kiss under it. Without it there’d be nothing down there worth the light. And that just happened by chance – trillions of odds against it – one bit of stardust meets another bit of stardust.’