Lab · Thought Experiment

The Fermi Paradox

If the universe is so old and so full of stars, where is everybody? This simulation shows how quickly a single technological civilization — even with a modest sub-light drive — could leave traces across the entire Milky Way.

Core premises

  1. An old, vast universe Given the age of the universe and its sheer number of stars, life should also exist beyond Earth — unless the emergence of life is an exception.
  2. Earth is not unique If Earth is not unique and our solar system is not unusual, other technological civilizations could exist in our galaxy.
  3. Crossing is feasible The Milky Way is ~100,000 light-years across. At 1–10 % of the speed of light, a single crossing takes 1–10 million years.
  4. Time enough for everything The galaxy is ~10 billion years old — meaning a crossing could have happened thousands of times.
Milky Way · Top-Down 0 M years

Parameters

1
1 % c
100,000 yr/s

Controls

0 M yr
Elapsed time
0M years
Reach (frontier)
0light-years
Galaxy explored
0%
Possible crossings
0× in 10 Bn yr

The paradox

This simulation only runs over 20 million years — a blink of an eye compared to the lifetime of the galaxy. Even a single civilization with a slow sub-light drive could have crossed the entire Milky Way in that time.

The galaxy is ~10 billion years old — enough time for 500 to 5,000 complete crossings. If even one civilization ever existed and expanded, it must have left traces everywhere.

That is why the silence itself is the most important observation: where are they?

Model: linear expansion on the galactic disk (Ø 100,000 ly). Simplification — no travel logistics, no lifetime limits, no star-system hops.