Overwhelming scientific consensus from centuries of astronomical observations, satellite imagery, and space missions drives the market's near-certain 99.3% implied probability for "No." Traders recognize the flat Earth idea as a fringe cultural meme with no supporting data from credible sources like NASA or international space agencies, while public sentiment in entertainment and pop culture treats it as settled fact rather than debate. Historical precedents from explorers and physicists reinforce this dominance. Realistic upset scenarios remain minimal, though a hypothetical large-scale hoax or unprecedented revelation could theoretically shift narratives in media coverage.