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In 2006, NASA's Arcade Instrument detected a bizarre sound. Radio waves from deep space six times louder than expected. It's called the Space Roar and no one knows what's making it. It's not stars, galaxies or black holes. It's just there, everywhere. Scientists have ruled out common sources and even the most advanced theories struggle to explain it. Some think its ancient hydrogen clouds. Others suggest something we haven't even discovered yet. It's like the universe is humming in a tone we don