Subspace was the medium used for long range communications such as subspace radio and subspace transponders. It was a distinct dimension from realspace, like hyperspace and otherspace.[1Subspace is an integral part of the space-time continuum, distinct, yet coexistent with normal space. Subspace and normal space are confluenced together. However, in some regions an interfold layer forms between the two realms. (VOY: "Real Life") Subspace has an infinite number of domains. Geordi La Forge compared it with "…a huge honeycomb with an infinite number of cells". (TNG: "Schisms")

Tetryon particles are a form of subatomic particle which can only exist naturally in subspace. If they are released into normal space, they exhibit erratic properties. This can only occur when the fabric of subspace comes into contact with normal space in some manner.

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