Venus is the second planet from Sol. Its surface is harsh and acidic, and not suited for human colonization.
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.
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.