Location: Milky Way / Minos Wasteland / Arrae System / Fourth planet
Prerequisite: Priority: The Citadel II (Mass Effect 3)
Description 
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Nirrus, a moderate-sized hydrogen-helium gas giant, is of mild interest to turian scientists because of its abnormal atmospheric composition. The planet has only a fraction of the expected methane, with high levels of carbon monoxide and ethylene instead.
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