Overwhelming scientific consensus from centuries of empirical evidence, including satellite imagery, orbital mechanics, and consistent geophysical measurements, underpins the 99.3% market-implied probability against a flat Earth. Traders recognize that no credible recent developments or cultural shifts have altered this established reality, with flat-Earth claims remaining confined to fringe online communities and occasional pop-culture memes rather than mainstream discourse. Historical precedents of similar pseudoscientific debates show they rarely sway institutional or public understanding. Realistic upset scenarios remain negligible absent an unprecedented global revelation or resolution criteria shift, though the inherent unpredictability of niche conspiracy narratives could theoretically spark short-term volatility in trader positioning.