Cloudscape

Self-replicating spacecraft could replicate until there were many enough to build even greater self-replicating spacecraft, which could then in turn replicate to build even greater spacecraft, so that through self-replicating spacecraft one could eventually create megastructures which could manipulate the solar system in any way theoretically possible. In this, these self-replicating spacecraft would be similar to self-replicating nanomachines, which could build even smaller self-replicating nanomachines and so on, so that nanomachines could eventually manipulate molecules in any theoretically possible way.