Overwhelming scientific consensus from physics, astronomy, and satellite data drives the 99.3% implied probability on "No" for Earth being flat, reflecting traders' recognition of centuries of verified evidence like orbital imagery and global navigation. This near-certain market sentiment echoes the fringe status of flat-Earth claims in popular culture, where they persist mainly as online memes or conspiracy narratives rather than serious challenges. No meaningful recent developments have altered the landscape, as mainstream science and public understanding remain firmly aligned. Realistic upset scenarios are virtually nonexistent, though a highly improbable viral hoax or misinterpreted observation could theoretically spark brief speculation without shifting the outcome.