A strange signal from deep space has been detected every 22 minutes for more than 30 years. Scientists have no idea what is causing it.

• A mysterious object spotted in the cosmos is beaming radio waves toward Earth every 22 minutes. 
• Signals from this type of cosmic object usually slow down over time.
• But this one has been sending signals for more than 30 years, and scientists can't figure out why. 

A cosmic object that has been pulsing radio waves toward Earth every 22 minutes for more than 30 years has left scientists baffled.