Have you ever gazed up at the night sky and seen something unusual, something that defies explanation? In the spring of 1806, two German astronomers observed such a phenomenon—Venus exhibited a faint glow on its nightside, a glow that seemed to resemble Earthshine. This observation sparked a centuries-long quest to uncover the source of this enigmatic light, a quest that has led to a myriad of hypotheses, from natural phenomena to the presence of extraterrestrial life.