Ever wondered why Earth looks flat even though it's a sphere? The planet's massive size makes its curvature nearly impossible ...

The only way to see the curve of the Earth is to fly more than 6 miles (10 kilometers) above its surface.

The Earth is about 42 million feet (12.8 million meters) wide, and even a tall adult’s viewpoint is just 6 feet (about 2 meters) above its surface.