Space flight should remain affordable and become more sustainable in the future. To achieve this, costs will have to be cut and implementation simplified and thus accelerated as well. But what might such a concept for the future look like? Space vehicles will be adapted to the needs of a mission and built from the start so that they are easy to service, conserve resources, avoid waste, and are costs-efficient. This means that space concepts will have to be reconsidered from the ground up: in the future, satellites and space stations will be composed of what might be called a kit of modular elements that are flexibly interchangeable. These kit elements, or building blocks, will be systematically filed in a catalogue of modules. All building blocks will have a standardised interface following a kind of “USB in space” principle, so that the space vehicles of the future may be built, serviced, and fuelled in space. Developed in Germany and called “intelligent Building Blocks for On-Orbit Satellite Servicing and Assembly” (iBOSS), this concept is expected to change space flight in a sustainable way and stirred up already attention at an international level.