With Project RAMA (Reconstituting Asteroids into Mechanical Automata), Made in Space with Additive Manufacturing plans to convert free floating asteroid into spacecraft. Earth has always suffered lack of minerals, and these asteroids with guided 3D Printing on them will force them transport themselves to mining facilities.

Source: http://www.rapidreadytech.com/2016/06/project-rama-theorizes-leveraging-3d-printing-to-convert-asteroids-into-spacecraft/

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