By Dirk Lorenzen
2020 will be the year of Mars. The red planet will approach Earth in early October to within 62 million kilometers. Four space agencies are set to take advantage of this close encounter and send spacecraft to Mars. The European Space Agency (ESA) will launch its ExoMars rover on a Russian Proton rocket from the Baikonur cosmodrome. ExoMars is set to land on the surface, dig into the soil and look for traces of past life. They will be looking for possible living microbes about half a meter below the Martian surface. Above it, harmful cosmic radiation makes life as we know it impossible.