Why is it physically impossible to generate true gravity using mass on a spacecraft?

Answer

Generating 1g of gravity requires the immense mass of a celestial body like a moon or asteroid.

True gravity is a fundamental physical force generated by the presence of significant mass. To produce an acceleration of 9.8 meters per second squared (1g) through mass alone, an object would need the gravitational pull comparable to a small moon or planet. Such an amount of mass is not viable for a spacecraft, as the vessel would become immobilized by the immense weight and size required, making it incompatible with propulsion and travel needs.

Why is it physically impossible to generate true gravity using mass on a spacecraft?

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