A Whisper from Space is a 1978 science documentary episode of the NOVA series that chronicles the groundbreaking discovery of cosmic microwave background radiation. While testing the Holmdel Horn Antenna in 1965, scientists Arno Penzias and Robert Wilson detected a persistent signal of 3.5 Kelvin background radiation from every direction in space. Initially suspected to be an equipment fault—even down to suspected pigeon droppings—the signal was ultimately identified as the residual radiation from the Big Bang, lending critical support to the Big Bang theory and Einstein’s General Theory of Relativity. The film presents the scientific method in action, highlighting how mistakes and persistence can lead to profound discoveries about the universe.