{"query": "General relativity — gravity is the curvature of spacetime", "count": 20, "results": [{"id": "card_rel_general", "title": "General relativity — gravity is the curvature of spacetime", "shelf": "codex", "surface": "secular", "snippet": "Mass-energy curves spacetime (the Einstein field equations) and bodies follow geodesics - the equivalence principle. Its tests (light deflection 1.75 arcsec, the gravitational redshift) are sealed on ", "authority_tier": "engine_derived", "source": "Narrow Highway — relativity", "readable": false, "generated": false}, {"id": "card_theory_quantum_gravity_problem", "title": "Spacetime & the quantum-gravity problem (where physics ends)", "shelf": "theories", "surface": "secular", "snippet": "Spacetime & the quantum-gravity problem (where physics ends) — an engine domain that can touch it: physics. 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A clock at 0.6c runs slow b", "authority_tier": "engine_derived", "source": "Narrow Highway — relativity", "readable": false, "generated": false}, {"id": "card_src_openstax_astronomy_2e_summary_3caa9650", "title": "Summary — Astronomy 2e", "shelf": "astronomy", "surface": "secular", "snippet": "Summary\n\n24.1\n\nIntroducing General Relativity\n\nEinstein proposed the equivalence principle as the foundation of the general theory of relativity. According to this principle, there is no way that anyo", "authority_tier": "reference", "source": "OpenStax: Astronomy 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_astronomy_summary_543413bb", "title": "Summary — Astronomy", "shelf": "astronomy", "surface": "secular", "snippet": "Summary\n\n24.1\n\nIntroducing General Relativity\n\nEinstein proposed the equivalence principle as the foundation of the theory of general relativity. 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