Jacob staring up at the sky, while redflames burst out behind him. The path of the earth through the asteroid belt is corrected by short volcanic bursts like this, micro-jets of geological flame which allow our super-planet (largest living lump in this section of the settled galaxy) to pass through (twice a week) with minimal impact. If the moon had also had a molten center, it too could have used such little rocket-volcanoes to twist through regions of dangerous impact. But it didn't, and look at its face now, roughed up by meteorimpacts and solar punches.