Overwhelming scientific consensus, centuries of empirical observation, and universal education drive the near-certain trader consensus that Earth is not flat, reflected in the 99.4% implied probability for "No." Satellite imagery, space exploration footage, and everyday navigation tools reinforce this reality across global culture, leaving flat-Earth claims as fringe internet memes without mainstream traction. Historical precedents like ancient Greek calculations and modern aerospace achievements further solidify the market's view. Realistic upset scenarios remain virtually nonexistent, as any shift would require overturning established physics and public knowledge on a planetary scale.