The Sun is the star of Earth and is found in the Galaxy. Other locations relevant to Metroid are Jupiter, mentioned in the Metroid Prime Trilogy art booklet. There is also a specific asteroid named Ceres, which gave the destroyed space colony of the same name its name.
Federation Solar System | Gaflar System | Kalandor region | Messina System | Extreme Galaxy
Milky Way Galaxy | Small star | SR388's solar system | Sun | Tetra Galaxy | Unknown Solar System