The flat-Earth theory fails to be scientific because it does not involve empirical evidence such as the shadow of Earth on the Moon and the disappearance of objects in the sea.
The empirical evidence can be defined as a type of supporting information about a scientific fact obtained by playing the scientific method.
The empirical evidence can be derived from observational and/or experimental procedures.
In conclusion, the flat-Earth theory fails to be scientific because it does not involve empirical evidence such as the shadow of Earth on the Moon and the disappearance of objects in the sea.
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