Complex Gravity

Editor: We are in 2109. The man made a success of his most ambitious project entitled : "Man on Mars".The oceans which were iced under the Martian crust now returned into the liquid state. The atmosphere is breathable, and the first plants begin to take life. All of this thanks to the uncountable scientific researches and the numerous expeditions of colonization.But what had to arrive arrived. In the vertiginous speed of 280 000 kph, a comet is going to collide the planet Mars, reducing to nothing all the projects of the man.Everything was thought to avoid the disaster: to deflect it by huge missiles,or,to send a satellite which would follow it in the same speed which would use the heat of the sun and an enormous mirror allowing to melt the comet... but the time necessary to set up such projects would set too much time.The only one possible solution is to run away from Mars! The idea is to finish the construction of a huge Vessel, started some months ago, and to put all the available staff above. But the essential elements are missing to end the vessel! You sent your scientists to look for the raw materials and Radioactive materials in the depthes of Mars.It is now necessary to get back them!