The Rhid-Kendalaran Nebula was discovered by Rhidaesiuth Sirestep and her husband Kendarln Sirestep (both originally Sorcerers of Tund) sometime around 6 BBY.  Calling it a nebula may be a stretch of the definition; where some other nebulae give birth to stars, this one appears to give birth to anomalies.  The nebula itself seems to have some sort of presence in the Force, though it requires a master illusionist to figure out where it actually is.

Community content is available under CC-BY-SA unless otherwise noted.