Yridia Nebula
The Yridia Nebula was a sizable nebula located near Yridia. Its radioactive  cosmic gases interfered with Starfleet sensors.

In December 2256, a  carrying Sarek was wrecked inside the nebula by the actions of logic extremist V'Latak. The , unable to enter the nebula as the high concentration of mycelium spores it carried would interact catastrophically with its cosmic gases, launched DSC 01 on a rescue mission. The shuttle crew was able to rescue Sarek before their craft was overwhelmed by nebular conditions. ()

Nebulae