If Earth were flat instead of spherical, life and physics would behave very differently. Gravity would not pull evenly toward the center like it does now. People near the edges might experience strange gravitational effects, and oceans could behave unpredictably instead of forming stable global sea levels.
Day and night cycles, seasons, and sunsets would also look very different. A flat Earth would struggle to explain why different parts of the world experience different time zones and why stars change depending on location. Satellite orbits, global navigation systems, and modern space exploration would likely not work the way they currently do.
Scientists know Earth is roughly spherical because of observations from space, gravity, astronomy, navigation, and centuries of scientific measurements and experiments.
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