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Mass Effect 2 Planetary Database: Entry Details
Tarith
System: Crescent Nebula
Cluster: Lusarn
Anomaly/Landable: Yes
Installation: Base Installation
Orbital Distance: 7.8 AU
Orbital Period: 16.7 Earth Years
Radius: 5,677 km
Day Length: 27.7 Earth Hours
Atmospheric Pressure: 0.84 Earth Atmospheres
Surface Temperature: 21 Celsius
Surface Gravity: 0.87 G
Tarith is broadly Earth-like, with a fatal flaw; it has a relatively high amount of chlorine in its atmosphere, the reason for the greenish haze that becomes apparent when looking at the horizon. Chlorine has become a vital component in Tarith's plant life; as a defense mechanism against native herbivores; many species evolved the ability to release clouds of toxic chlorine when disturbed. This gas is heavier than the atmospheric oxygen, and tends to settle in low places. While avoidable, this has placed Tarith near the bottom of the lists for colonization.

There are intermittent signals originating in the heart of a large chlorine swamp. They appear to be coded, though it is not impossible that they are garbled distress signals from a downed civilian ship.