Imprimante 3D, scanner 3D

Thoses who pretend that only sun and water are essential to create life in univers are wrong. The gravity is essential to group and mix atomes to create several ADN and atmospheric situation in a land. When you are able to create an artificial gravity, you can create an atmosphere where you want, so you don't need to go to Mars because you have possibility to build an artificial World with more interesting capacities than Mars :