Jacob staring up at the ciel , while rouge flammes burst out behind him. The path of the terre 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 lune had also had a molten centre , it too could have used such little rocket-volcanoes to twist through regions of dangerous impact. But it didn't, and look at its visage now, roughed up by meteorimpacts and solar punches.