No fan of a television series expects the writers to be complete experts on any given subject. Much less on Doctor Who, which explores the wibbly-wobbly timey-wimey every week, and without getting Stephen Hawking or Professor Brian Cox as a guest writer each time, it might prove a bit difficult (and expensive) getting all the theoretical physics absolutely right. However, basic biology is not time travel, and as such is slightly easier to understand. And one of the first things that every child learns about the birds and the bees (and, apparently, moon monsters) is that children do not give birth. So how can the giant flea monster, newly born out of the moon, suddenly birth a new moon? The answer, of course, is all the drugs the writers were taking. Drugs are the answer to all these questions. Like the question of how Clara could possibly gauge any information, while in space, from lights being left on in peoples houses? It takes a second to send a radio message from the Earth to the moon, and that data is probably better collated through the internet than any other way, but the writers probably while lighting another spliff, ignored all of that information, got high, and took their lightbulb moment literally.
