Add Space and Planets

Space would be a great addition to Minecraft, and it was shown that Mojang is capable of adding it with the April fools update.
How I am thinking of getting there is to have something along the lines of the Create Mod where you would be able to build it yourself and add thrusters to structures to make it able to go.

How you would be able to choose where to go is that you would craft a monitor to hook up to the space ship, and also be able to launch a space station into orbit from that.

How you would be able to breath without a spacesuit, is that you set up an oxygen generator in an enclosed environment, if it is not enclosed you will be gravitated towards wherever there is a leak.