The Amargosa observatory was a Federation space station that was in service in the late 24th century. The observatory was located in orbit of the Amargosa star and was used for scientific research regarding the star. Its coordinates were 917358-358268-102879.
In 2371, the station had a complement of nineteen personnel, including an El-Aurian named Dr. Tolian Soran. With the help of the Klingon outlaw Duras sisters, he had secured trilithium stolen from the Romulans, planning to build a trilithium weapon which was capable of stopping all nuclear reactions in a star, thereby causing its collapse. With this he armed solar probes which were hidden in a secret stash behind a magnetically sealed door protected by a dampening field.
The USS Enterprise-D answered a distress call from the observatory, which had been raided by Romulans who were searching for their stolen trilithium. Soran and four other scientists survived the attack and were rescued by an away team from the Enterprise. Having discovered that the Romulans were looking for trilithium, Geordi La Forge and Lieutenant Commander Data arrived to the station to investigate and discovered the hidden solar probe, and Soran, who had escaped the custody of the Enterprise in order to use the weapon on the Amargosa star. Commander William Riker and Lt. Commander Worf came to their rescue, but they were unable to stop Soran from capturing La Forge in the process.