For generations, humans have gazed at the stars and wondered if we are truly alone. Despite relentless efforts—radio telescopes scanning the heavens, robotic probes launched into deep space, and decades of scientific inquiry—no confirmed evidence of extraterrestrial life has surfaced.

This enduring mystery, often called the Great Silence, haunts both scientists and dreamers alike. Why, in a universe so vast, have we not found any sign of aliens? To answer this, researchers and thinkers have put forth a dazzling array of hypotheses, each offering a possible clue as to why our search has come up empty.