Flat Earth theory is the belief that the Earth is flat rather than a spherical shape. Proponents argue that the horizon appears flat and that if the Earth were round, we would see a curve. They often claim that photographs of the Earth from space are fabricated or manipulated. This theory contradicts centuries of scientific evidence, including observations from astronomy, physics, and satellite imagery. The overwhelming consensus among scientists is that the Earth is an oblate spheroid, meaning it is mostly round but slightly flattened at the poles.