Inspiration for space exploration can come from all corners. One of the most inspiring, or terrifying, sources of inspiration for some in space exploration came from computer science expert John von ...

It has been argued that self-replicating robotic probes could spread to all stars of our galaxy within a timespan that is tiny on cosmological scales, even if they travel well below the speed of light ...

The article on the power of biological computers as self-replicating, low-energy systems, capable of computation and problem solving, brought to mind von Neumann probes (10 June, p 36). These are ...