Within the physics community, there is full consensus that general relativity (GR) is the correct classical description of gravitation in the regimes tested to date: weak-field (solar system, laboratory), strong-field (binary pulsars, black hole mergers), and cosmological scales where it is combined with the standard cosmological model. This consensus is not merely institutional; it rests on more than a century of independent experimental confirmation across multiple methods, instruments, and research groups with no competing observation. The open question within the physics community is not whether GR is correct in tested regimes, but whether it is the final theory of gravity - specifically, whether it remains valid at the quantum scale, where it is widely expected (though not proven) to require modification or replacement by a theory of quantum gravity.

There is no competing expert community offering a rival empirically-supported account of gravitation at the classical level. Alternative classical theories of gravity exist and are actively studied, but none has demonstrated explanatory power matching GR's record across all tested domains. The dissent that exists is theoretical and exploratory - proposing where GR's domain of validity might end - rather than a rejection of its current evidential support.

GR's consensus status rests on independent confirmation across several distinct lines of evidence, gathered by separate teams using unrelated methods over more than 100 years.

The earliest confirmations were the three predictions Einstein specified in 1915: the anomalous perihelion precession of Mercury, the deflection of starlight by the Sun, and gravitational redshift. The precession of Mercury was already a known anomaly, and the prediction that light bending would match general relativity's value was confirmed by the 1919 solar-eclipse expedition, with increasingly precise measurements made in subsequent tests. The 1919 Eddington expedition's observation that light deflection was twice the value predicted by Newtonian mechanics and the equivalence principle alone established general relativity as a major departure from classical gravity.

Gravitational redshift was harder to confirm terrestrially. It was first confirmed experimentally in 1959 using the Mössbauer effect in the Pound-Rebka experiment, measuring redshift between sources at the top and bottom of a tower at Harvard, with results in excellent agreement with general relativity; later refinement by Pound and Snider improved the precision to better than the 1% level.

Subsequent decades produced order-of-magnitude improvements in measurement precision. Solar-system tests progressed from roughly 0.2 percent accuracy with Viking Lander microwave ranging to Mars in 1976, to about 0.15 percent with spacecraft and planetary radar, to a further order-of-magnitude gain via very-long-baseline interferometry of quasars and lunar laser ranging, before 2003 Cassini spacecraft experiments pushed accuracy to roughly 0.0023 percent. Other post-Newtonian-level tests - light deflection, the Shapiro time delay, Mercury's perihelion advance, and the Nordtvedt effect in lunar motion - have similarly reached high precision, all consistent with general relativity.

The equivalence principle, on which GR's geometric structure depends, has independent experimental support. It is well supported by experiments including the Eötvös experiment, tests of special relativity, and gravitational redshift measurements.

Binary pulsar systems provided the first strong-field tests. Gravitational wave damping has been detected in the Hulse-Taylor binary pulsar in an amount agreeing with general relativity to better than half a percent, with other binary pulsar systems yielding further strong-field tests.

Direct gravitational-wave detection, beginning in 2015, opened a new and increasingly stringent category of strong-field test. A 2025 detection illustrates the current state of the art: the gravitational wave GW250114, produced by a black hole merger, was detected by the LIGO, Virgo, and KAGRA collaborations and analyzed in a paper on black hole spectroscopy and tests of general relativity published in Physical Review Letters. The analysis tested a specific GR prediction about how a merged black hole's vibrational “tones” relate to its final mass and spin. Agreement between independent measurements of those tones effectively verifies general relativity, whereas a mismatch would point toward physics beyond it. A companion analysis of the same 2025 signal also confirmed a roughly 50-year-old prediction by Stephen Hawking concerning black hole event-horizon area, finding that the merged black hole's horizon area exceeded the combined area of the two progenitor black holes, consistent with Hawking's theorem.

Gravitational lensing extends the tested range of GR far beyond the solar system. Observations of gravitational lensing of distant quasars and galaxies by intervening galaxies and galaxy clusters test general relativity over a distance range ten orders of magnitude greater than solar-system tests, and - although less precise than solar-system or pulsar-timing tests - confirm the validity of general relativity and its Newtonian weak-field limit at galactic and intergalactic scales, while also indicating large quantities of dark matter.

General relativity has passed every test multiple generations of researchers have thrown at it, across independent methods (astrometry, radar ranging, atomic spectroscopy, pulsar timing, interferometric gravitational-wave detection) and independent institutions and funding sources (universities, national laboratories, and international collaborations spanning the United States, Europe, and Japan). This breadth is the basis for describing the consensus as full rather than partial.

The consensus that GR is correct in tested regimes does not extend to claims about its status as a final or complete theory. Several questions remain genuinely open within the physics community, not as a matter of competing camps within classical gravitational physics, but as acknowledged frontiers:

• Quantum gravity. GR is incompatible with quantum mechanics in regimes of extreme curvature (black hole singularities, the early universe). Whether the equivalence principle, central to general relativity, holds at the quantum level is not known and is simply assumed rather than established at fundamental scales - a question treated as crucial to any self-consistent theory of gravity. No experimentally confirmed theory of quantum gravity exists.
• Strong-field regime beyond current tests. Physicists anticipate that black hole spectroscopy using future space-based detectors such as LISA in the 2030s will either deliver striking confirmation of general relativity in the strong-gravity regime, or reveal deviations pointing toward new physics such as quantum gravity. The strong-field regime near black hole horizons and singularities is less thoroughly tested than the weak-field solar-system regime.
• Dark matter and dark energy. Cosmological-scale applications of GR (via the standard ΛCDM model) require unobserved dark matter and dark energy components to fit observations. Whether this reflects new physics, modified gravity at cosmological scales, or genuinely unseen matter/energy is unresolved and is the subject of active, unsettled research - distinct from, though sometimes conflated with, tests of GR itself.
• Search for new interactions. Ongoing tests of the equivalence principle and the inverse-square law continue searching for new interactions that might arise from unification or quantum gravity, using techniques such as laser-cooled atom and ion trap experiments and proposed “fifth force” searches. Atom interferometry has been proposed to test the equivalence principle to a part in 10^15 or better, and to probe general-relativistic effects to several additional decimal places, potentially rivaling or exceeding astrophysical precision.

These open questions are not evidence against GR; they describe the boundary of what current tests have probed, and the theoretical expectation - not yet experimental demonstration - that GR will eventually require modification at the quantum scale.

• general-relativity-alternative-theories-of-gravity-viewpoint - modified or alternative classical gravitational theories (e.g., MOG, certain modified-Newtonian-dynamics extensions) proposed as competitors to GR, primarily motivated by the dark matter and dark energy problems
• general-relativity-quantum-gravity-approaches-viewpoint - research programs (string theory, loop quantum gravity, and others) addressing where and how GR is expected to break down, without claiming current experimental refutation of GR
• general-relativity-philosophical-interpretation-viewpoint - disagreements among philosophers of physics over the interpretation of spacetime, causality, and ontology within GR, distinct from disputes over its empirical adequacy

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5. “How Black Hole Spectroscopy Can Put General Relativity to the Test,” *Physics Today*, April 10, 2025, https://physicstoday.aip.org/features/how-black-hole-spectroscopy-can-put-general-relativity-to-the-test.
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9. Orfeu Bertolami and Jorge Páramos, “Precision Gravity Tests and the Einstein Equivalence Principle,” arXiv:2002.02907 (2020).
10. A. G. Abac et al. (LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration), “GW250114: Testing Hawking's Area Law and the Kerr Nature of Black Holes,” *Physical Review Letters* (2026), arXiv:2509.08054, https://arxiv.org/abs/2509.08054.