A Matter of Timing

One underappreciated piece of the Fermi Paradox is timing. The Milky Way is 13 billion years old, but Earth-like conditions likely became possible only after enough heavy elements built up — and exactly when is uncertain. Some regions may have turned habitable long before Earth formed, giving any civilizations there an enormous head start.

Conversely, early galaxies were more violent places — frequent supernovae, intense radiation, and less chemical diversity may have delayed life until relatively recently. If most habitable worlds only became suitable in the last few billion years, many civilizations across the galaxy may simply be too young to have reached us yet.