Researchers detected mysterious radio waves in Antarctica that seem to defy the rules of particle physics. Now they're searching for a cause.

ANITA was placed in Antarctica because there is little chance of interference from other signals. To capture the emission signals, the balloon-borne radio detector is sent to fly over stretches of ice, capturing what are called ice showers. Credit: Stephanie Wissel / Penn State

The signals were recorded by instruments normally designed for detecting subatomic particles and are emitting at angles that a team of researchers described as 'unexplainable'