This discovery also suggests other small bodies may lurk in the Pluto system - and, if so, New Horizons should root them out when it flies by. But more "targets" might not be the best thing for the mission."The discovery of P4 is exciting, but it also raises the possibility that our New Horizons spacecraft may enter a more hostile environment than we previously imagined," says Glen Fountain, New Horizons project manager from APL.