Tetryon Radiation is a form of radiation associated with and generally only found in subspace.
Tetryon Radiation are subatomic particles native to another Subspace Frequency in our N-Space or particles in a similar situation. They have random mass, meaning they are impossible to predict and thus play havok with sensors. Their random mass and other-phasic nature means they can and generally do wreak havoc in local Space Time. Some theorize that they are trying to forcibly shunt back to their proper Phase Frequency.