DOTLAN EveMaps

In 2148, scientists discovered a cache of alien technology buried on Mars. These species were known as the Protheans, who disappeared for unknown reasons 50,000 years ago. In 2149, an exploration team near the edge of the solar system discovered that Charon, Pluto's moon, was actually a mass relay, a dormant piece of ancient Prothean technology covered by sheets of ice. The Charon Relay granted instant travel across thousands of light-years to another mass relay in a different area of the galaxy