A Delphic Expanse sphere
A sphere generating gravimetric energy
The Delphic Expanse spheres were a series of artificially-created objects the size of small moons that were scattered around the Delphic Expanse. The spheres generated massive amounts of gravimetric energy, and were responsible for the web of spatial anomalies which constituted the Expanse. Each sphere was surrounded by a cloaking barrier which kept it hidden from outside observers. According to the Xindi-Primate Degra, there were seventy-eight spheres in total. (ENT: "The Forgotten")
Starfleet first encountered the spheres in 2153, when the Enterprise NX-01 entered the Expanse in search of the Xindi. The first sphere they came across was being used as a base for Osaarian pirates. Enterprise engaged in battle with an Osaarian vessel within the cloaking barrier of the sphere, and was able to take a series of detailed scans. Quantum dating of the sphere indicated it was at least one thousand years old. (ENT: "Anomaly")
Upon further investigation, the Enterprise crew was able to determine that the spatial anomalies which riddled the Expanse occurred at points where the waves of gravimetric energy being emitted from the spheres intersected. This led T'Pol to hypothesize that the spheres were created for the express purpose of creating the Expanse. Enterprise later encountered the Triannons, who held that supernatural beings whom they referred to as "the Makers" had created the spheres to reconfigure space in preparation for their eventual return. The Enterprise crew later discovered that the Triannon myth was based in fact, and that the spheres had been created by a race of transdimensional beings who were attempting to make the Expanse habitable for their species as a prelude to invasion. (ENT: "Exile", "Chosen Realm", "Harbinger")
Captain Archer learned from Daniels, a temporal agent from the 31st century, that, in the 26th century, the Expanse would grow to encompass fifty thousand light years of the galaxy, and that the Sphere Builders were trying to manipulate the Xindi into destroying Humanity in an attempt to prevent the founding of the United Federation of Planets, which would ultimately defeat the Sphere Builders. With this information, Archer was able to form an alliance with some of the Xindi against the Sphere Builders. (ENT: "Azati Prime")
A map of the spheres
The crew learned from Degra that the spheres were controlled by a network of artificial intelligence, and that each sphere held a redundant memory core. A team from Enterprise was able to gain access to the interior of a sphere through an exhaust port which was holographically disguised. The team was successful in retrieving the memory core, but not before Corporal Hawkins was killed by an automated defense system. (ENT: "The Council")
With the information retrieved from the memory core, T'Pol was able to determine that each sphere was connected by an interspatial manifold on its surface, and that four of the spheres were integral to the connection. Enterprise was able to disable the manifold of the sphere designated "Sphere 41" with a deflector pulse, causing a chain reaction resulting in the destruction of the entire sphere network, and eliminating the spatial anomalies in the Expanse. (ENT: "Zero Hour")
Spheres encountered by Enterprise
Numbered
- Sphere 1. This sphere, encountered in September of 2153, was being used by Osaarian raiders as a base. It was located in the Orassin distortion field. (ENT: "The Xindi", "Anomaly")
- Sphere 2. Subcommander T'Pol theorized the existence of this sphere, located not far from Tarquin's planet, and turned out to be correct. Its level of gravimetric energy was much higher than that of Sphere 1. Captain Archer and Commander Tucker took detailed measurements of this sphere in a trellium-lined shuttlepod, as Enterprise could not get close to it. These measurements allowed T'Pol to calculate that there must have been at least fifty spheres in the Expanse. (ENT: "Exile")
- 12th Sphere (Triannon designation). This sphere was 6.3 light years from the Triannon homeworld. D'Jamat's ship had been on a pilgrimage there for several months when discovered by Enterprise. As far as Enterprise could establish, it was completely identical even in the smallest details to sphere 1 and 2. (ENT: "Chosen Realm")
- Sphere 41. T'Pol determined that this sphere was a key to the sphere network's energy grid, and with Commander Tucker developed a means of destroying it using Enterprise's navigational deflector array. This plan was successful, and triggered a chain reaction, destroying all of the spheres within the Expanse. The destruction of the spheres returned the Expanse to normal space, devoid of anomalies. (ENT: "Countdown", "Zero Hour")
Unnumbered
- Enterprise rendezvoused with Degra's shuttle behind the cloaking barrier of a sphere so that Captain Archer could show Degra and Jannar evidence of the Guardians' duplicity. It was not far from the Azati Prime system and about a dozen light years from the Xindi Council planet. (ENT: "The Forgotten")
- A sphere just outside the solar system containing the Xindi Council planet. An Enterprise team went inside it to steal its redundant memory core. Corporal Hawkins was vaporized on the mission. (ENT: "The Council")
- The Sphere Builders used a sphere to generate anomalies to protect the Xindi superweapon from an attack by the Arboreals, Primates, and Aquatics. (ENT: "Countdown")