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abstraction > hypothesis > theory > physics theory > relativity theory

relativity theory
subject			fact

relativity theory	is a kind of physics theory
theory	has validity correct or incorrect with caveats
	has author or reasearch group
	has domain a field of research
	has date or a range of dates for which the theory was active

Kinds of relativity theory :

• general relativity (8 facts) (Einstein's theory of gravity) - Gravitation is a curvature in four-dimensional space-time rather than as a force existing between two masses.
• special relativity (6 facts) - Relativity theory that explains Lorentz contraction and time dilation for observers in relative motion.