Aim for the red circle on comet 67P/Churyumov–Gerasimenkoesa/Rosetta/Navcam- cc by-SA IGO 3.0By Adam MannRosetta’s final order is in: go caving. After two years orbiting 67P/Churyumov–Gerasimenko, the European Space Agency craft will crash into a cave on the comet’s surface on 30 September. Its target is a once-active pit nicknamed Deir el-Medina,...