Neutrino

Neutrinos are elementary particles, that have very small masses, and hence travel at close to the speed of light. Although they interact very rarely, a starship's sensor array contains instruments capable of detecting them.

The presence of elevated neutrinos may indicate the presence of a ship – possibly cloaked. The Bajoran wormhole also emitted neutrinos before opening, giving Deep Space 9 a moment to prepare before any ship came through.

References

• Duras accused Mogh, Worf's father, of sending coded neutrino pulses to signal the Romulans, leading to the Khitomer Massacre.

• Aa neutrino field was used to isolate the Enterprise-D's cargo bay when aliens posessed three of its crew members.

• Deep Space 9 recognized that neutrino emissions were an indicator that the Bajoran wormhole was opening.

• Major Kira Nerys identified a Maquis ship by its neutrino signature in the Badlands.

• Data detected neutrino emissions coming from a lake on the Ba'ku planet and, discovered a cloaked Federation holo-ship.