Venus is the second planet from Sol. Its surface is harsh and acidic, and not suited for human colonization.
History
Background
Eight decades ago, Tycho Manufacturing and Engineering Concern were slated to create a network of high-atmosphere floating cloud cities above Venus. The project was canceled, and led to a lawsuit that lasted for at least 8 decades, involving, among many other parties, Mao-Kwikowski Mercantile.
Eros Incident
 “Welcome to the future” — Spoilers for Leviathan Wakes follow.
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After the Eros incident, the protomolecule-infested Eros crash-landed on Venus after Miller persuaded Julie Mao, who controlled it, to land there instead of Earth. The protomolecule spread over the entire planet's surface.
The Ring
| “Break on through” — Spoilers for Abaddon's Gate follow.
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After a little more than a year of development, the protomolecule organism left Venus and became the Ring out in Uranus's orbit.