1. ANSWER — False. The Earth is an oblate spheroid (roughly spherical), not flat. This has been scientific consensus for over 2,000 years, confirmed by ancient observations, modern satellite imagery, and space missions.123

2. EVIDENCE — NASA (March 11, 2025) explains ancient Greeks used star motions and Sun shadows to prove sphericity; Magellan's crew circumnavigated without falling off an "edge"; space photos since the 1960s show a round Earth.1 Wikipedia (accessed 2026) notes Aristotle's empirical evidence ~330 BC; flat Earth is "scientifically disproven."2 NOAA (June 16, 2024) states Earth is an irregularly shaped ellipsoid due to rotation and gravity.3 Britannica (accessed 2026) confirms empirical observations disproved flat Earth; modern revival is via social media despite evidence.4 Space.com (April 4, 2025) lists proofs like ship hulls vanishing over horizon, lunar eclipses, and high-altitude photos.5 No credible 2026 sources support flat Earth; it's labeled pseudoscience and conspiracy.6

3. CREDIBILITY — 10/10. Overwhelming, repeatable evidence from multiple independent sources (NASA, ESA, amateurs) with no valid counter-evidence.

4. BIAS — CENTER. Sources are scientific institutions (NASA, NOAA), encyclopedias (Wikipedia, Britannica), and fact-checkers (Reuters, Full Fact).78