A1-D2 is an unusually small hydrogen-helium gas giant, with traces of sulphur and hydrocarbons in the atmosphere. Initiative probes provided inconclusive evidence of hydrocarbon life in the atmosphere (over 1000 meters below the cloud tops), where pressure compresses the hydrogen atmosphere into massive water, methane, and ammonia oceans.

Proof of life in the atmosphere proves many long-standing theories about hydrocarbons back in the Milky Way.

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