Special relativity is a theory that explains how speed affects mass, time and space. It applies to observers moving at constant speeds. On the other hand, general relativity is a theory that describes the relationship between an observer and acceleration, and pertains to gravity and acceleration.

General relativity is more general than special relativity and assumes that a wider class of observers are equivalent. More precisely, all non-rotating frames are equivalent. Thus, general relativity cannot be valid without special relativity.
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