|Location||Innermost planet, FS-176 System|
|Mass||3.8 trillion teratons|
|Atmosphere||Rife with Miteralis|
|Distinct features||Retrograde orbit around sun.|
Bilium is a planet in the FS-176 System. Its only mention was in the Space Pirate Observatory in Metroid Prime. A notable feature of the planet is that it is the closest planet to its star, FS-176. It is one of three known objects in the system to have a retrograde orbit, however it has a normal rotation. Otherwise, it has one of the most stable orbits and does not approach or cross paths with other planets like the rest in the system do. It is very close to a large asteroid field that encloses it in with its sun.
Mass: 3.8 trillion teratons.
Atmosphere is rife with Miteralis, a sentient gaseous Global Exterminator virus."
Bilium has 3 moons orbiting it, one of which has an incredibly low orbit.
- Interestingly, the name Bilium carries the prefix, bili- (L. bilis; bile) and the suffix -um, which creates a noun indicating the presence of.
|Planets in the Metroid Series|
|Note: Italicized locations were visited by Samus Aran.|
Underlined planets were destroyed.
|Bilium | Oormine II | Tallon IV | Twin Tabula | Zebes|
|Alinos | Arcterra|
|Aether | Dark Aether|
|Federation Solar System|
|Bryyo | Elysia | Norion|
|Unknown Solar System|
a.k.a. Planet SN-883 or Urtraghus ("large booty")
|SR388 | Unnamed planet|
|Earth | Jupiter|
|Charybdis | Inteira | Scylla|
| 2466 URSA | Bes III | Daiban | Degrade | Jamoru |
Jatsuk | Jigrad | K-2L | Kankeh | Liberty
Naishii | Nest | RX 338 | Solairon 12 | Vho