Name: Polis Massa
Region: Outer Rim Territories
Sector: Subterrel sector
System: Polis Massa system
Grid coordinates: K-20
Trade routes: Hydian Way
Class: Planetoid
Atmosphere: Type IV
Climate: Formerly arid, now none
Gravity: 0.56 standard
Primary terrain: Asteroids
Points of interest: The Local Dig
Native species: Eellayin
Immigrated species: Kallidahin
Major cities: Polis Massa Base

Description: Polis Massa was an asteroid field located in the Subterrel sector of the galaxy's Outer Rim Territories, far from any major hyperspace lanes. At some point, Polis Massa was a planet located within the system of the same name. The planet was home to a subterranean people called the Eellayin until it was destroyed by a mysterious cataclysm.

History
Five hundred years before the end of the Clone Wars the Archaeological Research Council of Kallidah established a base on one asteroid in order to excavate its surface to study the reasons behind the planet's destruction. The Kallidahin eventually came to be known as Polis Massans. Archaeology was scant and not much was found.

50 years before the Clone Wars, researchers found the ruined city of Wiyentaah. Since then, the local dig was set up and started excavating.

Following the execution of Order 66, Polis Massa became a safe haven for surviving Jedi. Shortly after the lightsaber duel between Obi-Wan Kenobi and Darth Vader on Mustafar, Padmé Amidala gave birth to twins, Luke and Leia, at the medical facility located on Polis Massa.

During the Galactic Civil War, Polis Massa served as an Alliance to Restore the Republic regional headquarters and operations sector. Polis Massa was included in a map of the galaxy that listed safe worlds, starfighter hubs at level five or higher, regional headquarters and operations sectors, and deep space caches.

Vader visiting in quest for vengeance on those who hid his son from him. Following capturing Amidala's tomb on Naboo, Vader traveled to Polis Massa with his death troopers and forensics droid ZED-6-7, searching for answers. Arriving at the ruins of the Polis Massa Base, ZED-6-7 said that Polis Massa had been a rebel base prior to being bombarded by the Empire years earlier. The Amidalans who wanted to kill him, believing he was responsible for the deaths of Amidala and Skywalker, followed him there. Vader deflected the blasts from their ships and his death troopers took control of the cannons and destroyed many of their ships. The Amidalans made an attempt at a ground assault, only to be cut down by Vader and his death troopers. When ZED-6-7 found a damaged Chroon-Tan B-Machine midwifery droid, he accessed her memory and found footage from the day Amidala had been brought there. Vader then watched the recording of Amidala's final words saying there was still good in Anakin. This infuriated Vader and he cut down the droid and returned to Coruscant.

Locations
Polis Massa Base
The Polis Massa Research Base, also known simply as Polis Massa Base, was a facility set up by the Kallidahin people on the largest of the asteroid fragments of the former planet Polis Massa. The Kallidahin archaeologists hoped to uncover an evolutionary link between their species and the extinct natives of Polis Massa, the Eellayin.

Research at Polis Massa Base continued for around five hundred years, with surveys and excavations taking place throughout the asteroid belt. Fifty years prior to the formation of the Galactic Empire, researchers uncovered the ruins of the ancient city of Wiyentaah in close proximity to the base itself. A Local Dig project was quickly set up, with artifacts found during excavation taken back to the Research Base for study.

The researchers were not content with merely studying their finds, however. With cloning skills learned from the Kaminoans, the xenobiologists at Research Base hoped to resurrect extinct organisms from ancient biological material found at the Local Dig. This project brought about the need for a sophisticated biomedical facility, constructed as part of the Polis Massa Base.

The sterile medical facility was stocked with the latest scientific technology, and contained rooms dedicated to the study of relics, and medcenters designed for experimentations on genetic material brought to the facility. Observation domes looked out over the complex (e.g. Wayside Dome and Topside Dome), and two landing bays provided access to the main base. Larger ships could touch down on the surface of the asteroid itself.

Obi-Wan Kenobi brought Padmé Amidala to Polis Massa Base for immediate treatment to deliver her twins. Padmé's treatment was overseen by a GH-7 medical analysis unit, who was soon joined by a midwife droid when Amidala went into labor. Though the droid successfully delivered her twins, Padmé herself succumbed to her mental injuries, and died on the operating table after losing the will to live.

Later, the base was attacked by the Galactic Empire. The battle was fought over the Death Star plans that were beamed from the Death Star during a prison break.