Scientists like to refer to our planet as residing in the "Goldilocks zone," where it's neither too hot nor too cold, and just the right distance away from the Sun to support life. But in the classic "Goldilocks" fairy tale, our eponymous protagonist is forced to flee from the bear's abode she rudely invited herself into, and never comes back. No more perfect porridges or adequately sized beds. That could be the case for Earth one day, if we are to exhaust this analogy. Instead of being booted o