66: The Black Knight Satellite - Watching us from orbit for 13,000 years
The Why Files: Operation Podcast
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The Mystery of Radio Echoes
Long-delayed echoes are signals that bounce around the earth several times. In 1954, two American newspapers reported a story that might explain these radio echoes. The story got scientists very excited but also caused the Pentagon to panic. Throughout the late 1950s, there were multiple observations of what was called a dark satellite. By 1960, the Defense Department finally acknowledged it. Today, the identity and origin of the mystery satellite is not known despite nearly two weeks of tracking.
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