A 50-year space mystery, solved. In 1977, a radio telescope picked up a signal so strong an astronomer simply wrote "Wow!" next to it—and the mystery stuck for nearly 50 years. The signal never repeated, fueling decades of speculation about everything from alien contact to unknown cosmic phenomena. Now, a study suggests the truth is actually a rare burst of energy from hydrogen clouds in deep space. So, not aliens, but still a reminder of how strange the universe can sound when it briefly speaks.
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