kardashev-scale

A Dyson sphere — a structure capturing all of the Sun's energy — would harness 3.86 × 10²⁶ watts, more than a trillion times humanity's current power use. Building it requires more material than exists in any individual planet, but could in principle be done by dismantling Mercury or several asteroids.

The nearest star is 4.24 light-years away — roughly 40 trillion kilometres. Reaching it with current technology would take 80,000 years. What would it actually take to become a civilisation that spans multiple star systems?

In 1964, Soviet astronomer Nikolai Kardashev proposed ranking civilizations by the power they command. Type III means a whole galaxy. Humanity sits near 0.73, and the arithmetic of getting from here to Type III is humbling.