Space X is a private space company that is setting its goal to get people on Mars. They have already gotten a Tesla roadster into space and that is already pretty hard. But getting to Mars is a totally different story. Space X has already come up with a plan to get people to live on Mars. First they're going to send up some people to set up part of the civilization and set up greenhouses and mining areas. it will take multiple years to set up the first colony and many more years for the rest. But the tricky part is all the radiation because earth has a magnetic field and Mars doesn't. So on mars a compass will not work and after long periods of time the radiation can kill us.