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Civilisation Horizons

Big questions, clearly separated from present capability.

Some ideas ask us to think far beyond the scale of today's projects. A civilisation drawing on a star's energy, a vast collection of orbital solar collectors or a computing system built around a star can stretch the imagination in useful ways. They can also blur the boundary between a scientific concept and an engineering plan. This collection keeps that boundary visible. We explain concepts such as the Kardashev scale, Dyson swarms and Matrioshka brains, including their assumptions and the unanswered questions they raise. The purpose is thoughtful exploration of possible futures. Ambition gives us reasons to look ahead; careful language helps us understand how far those horizons remain from demonstrated capability.

5 articles

01Explainer2 min read

A Dyson Swarm Is a Question About Civilisation’s Scale

A Dyson swarm imagines many collectors around a star. Kardashev Type II describes stellar-scale energy use. Both help organise big questions, but neither proves a practical route, a development timetable or a desirable social outcome.

Civilisation HorizonsSpace Infrastructure
04Perspective2 min read

A research library that earns trust

A useful library helps readers distinguish evidence, interpretation and ambition. This founder’s note explains the editorial standards we are designing into GalaxyLink.

GalaxyLink ResearchAI & Compute
05Perspective2 min read

Better living on Earth as the test of a space ambition

Space exploration and responsibility towards Earth belong together in GalaxyLink’s founding purpose. This perspective proposes the questions that should test whether a technological ambition creates worthwhile human benefit.

GalaxyLink ResearchSpace Infrastructure

Key concepts

Dyson swarm
A hypothetical collection of independent structures orbiting a star to collect some of its energy. It is usually discussed as an alternative to a single rigid shell, with substantial unresolved engineering and orbital-management questions.
Kardashev scale
A framework for discussing hypothetical civilisations by their energy use. Its familiar categories concern planetary, stellar and galactic scales. It is a conceptual classification, not a dated technology roadmap or a measure of human wellbeing.
Matrioshka brain
A hypothetical star-powered computing structure, commonly imagined as nested layers that use energy and rejected heat at different temperatures. It is a speculative concept with major physical and engineering questions, not a computer that currently exists.