The overwhelming scientific consensus, backed by satellite data, gravitational measurements, and centuries of empirical observations, drives the market's 99% implied probability for a "No" outcome on whether Earth is flat. Traders see no credible recent developments or cultural shifts capable of upending this established reality, with flat Earth notions largely relegated to fringe online discourse, memes, and occasional entertainment portrayals in documentaries or social media trends that fail to gain mainstream traction. Historical precedents from ancient calculations to modern space imagery reinforce the position. Realistic upset scenarios would require extraordinary, verified evidence overturning core physics, an event unlikely to emerge outside established scientific channels.