What is the primary reason necessitating Starship's unprecedented size, distinguishing it from single-use rockets?

Answer

Full and rapid reusability

Starship’s colossal size is intrinsically linked to its intended full and rapid reusability, which requires carrying extra propellant reserves for the Super Heavy booster to return and land.

What is the primary reason necessitating Starship's unprecedented size, distinguishing it from single-use rockets?

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