Planets Don't Need A Stabilizing Moon To Be Habitable

There's a long-held view among astrobiologists that planets need the stabilizing influence of a large moon to foster life. But a new study suggests that a stable tilt isn't a prerequisite for habitability — and that off-kilter planets may be more hospitable to life than stable ones. » 4/16/14 2:58pm 4/16/14 2:58pm