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A Radio Signal In Space Has Been Repeating Every 21 Minutes for 30 Years And Scientists Don't Know Why
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Another mysterious deep space radio burst is sending signals to Earth every 157 days, study finds - CBS News
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A mysterious interstellar radio signal has been blinking on and off every 22 minutes for over 30 years
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Earth Receives 8-Billion-Year-Old Radio Signal From Deep Space; Here's What Scientists Know So Far - Science
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