Per 
Item #: SCP-XXXX
Object Class: Keter
Special Containment Procedures: SCP-XXXX's activities in the Tau Ceti system are to be monitored for any changes in routine. This monitoring will be performed by a team of personnel on board a spacecraft equipped with a stealth system, an Ambrose-Alcubierre Thaumatic Superluminal Engine, and a self-destruct system. The crew is to maintain a minimum safe distance of 100 km from any quantity of SCP-XXXX. Should the craft become compromised by SCP-XXXX, the self-destruct system must be activated.
An array of automated defense satellites is to be constructed in the Kuiper Belt. Should an instance of SCP-XXXX-1 be detected on an approach trajectory to the Solar System, this array will disable the instance with EMPs before destroying it.
Standard astronomical disinformation protocols apply to any potential civilian observations of SCP-XXXX.
Proposals for the neutralization of SCP-XXXX are under consideration.
Description: SCP-XXXX is the collective designation for a large number of self-replicating nanomachines capable of restructuring matter on a molecular level. These nanites were likely created by an advanced technological society that previously inhabited the fourth planet of the star Tau Ceti. At some point within the last century, this society lost control of SCP-XXXX, resulting in an NK-Class "Gray Goo" scenario. Currently, SCP-XXXX accounts for approximately 2% of the planet's total mass.
The nanites comprising SCP-XXXX demonstrate a high degree of coordination and the capacity for complex decision-making and long-term planning, enabling them to assemble a wide variety of macro-scale structures. SCP-XXXX has used this ability to create functioning rockets in order to spread throughout the Tau Ceti system. As a result, every major solid planetary body in the system is undergoing an NK-Class scenario.
Discovery:
