Humans have known for more than 2,000 years that the Earth is not flat, with scientific understanding and pictorial evidence from space proving its round shape.
Flat-Earth theorists use selective high-altitude images to claim a flat horizon, but even lower altitudes like the retired Concorde plane's 60,000 feet show Earth's curvature.
Photos from the International Space Station, orbiting at about 250 miles high, confirm the Earth's round shape, despite slight imperfections due to rotation forces.
NASA explains Earth is a sphere but not perfect due to rotation forces, while evidence from space also shows other planets are round, supporting the Earth's shape.
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