Alien Megastructures - Cosmic Silence

Could alien megastructures exist… but self-destruct before we ever detect them?
That’s the theory behind why we haven’t spotted signs of super-advanced civilizations. Structures like Dyson spheres—designed to harvest the energy of an entire star—would be a clear sign of intelligent life. But we’ve seen nothing.
One possible reason? These megastructures might be inherently unstable. Managing the energy output of a star is no small task—it’s a delicate balance. One miscalculation, and the whole system could collapse.

Even if a civilization gets it right, these massive projects might only last a few thousand years—just a blink in cosmic time. Meanwhile, light from distant stars takes tens of thousands—even millions—of years to reach us. So by the time that signal hits Earth, the structure may be long gone.
This could explain the silence in the skies: not because alien life is rare, but because we're always looking too late. Civilizations rise, build, collapse… and we miss the window to see them.
It’s a haunting possibility—and a powerful reminder of how fragile even the most advanced technology might be on a cosmic scale.