|Universe||Mass Effect Universe|
|Atmosphere||Hydrogen, Helium, Ammonia & Nitrogen|
|Orbital Period||990.5 Earth Years|
|Day Length||16.9 Earth Hours|
|Notable Species||Planktonic ammonia-based lifeforms|
The upper levels of Notanban's atmosphere are inhabited by "shoals" of tiny ammonia-based lifeforms, no larger or more complex than the plankton of Earth's oceans. Held aloft by air pressure and wind, these bioluminescent creatures constantly flee from the approach of the terminator. Should they be exposed to the light and heat of Grissom, they die.