Published online by Cambridge University Press: 30 September 2008
We review the experimental evidence for Einstein's special and general relativity. A variety of high precision null experimentsverify the weak equivalence principle and local Lorentz invariance,while gravitational redshift and other clock experiments support localposition invariance. Together these results confirm theEinstein Equivalence Principle which underlies the concept thatgravitation must bedescribed by a metric theory.Solar system experiments that test the weak-field, post-Newtonianlimit of metric theories strongly favorgeneral relativity. The BinaryPulsar provides tests of gravitational-wave dampingand of strong-field general relativity. Recently discovered binarypulsar systems may provide additional tests. Ongoing and futureexperiments, such as the Gravity Probe B GyroscopeExperiment, satellite tests of the Equivalence principle, and tests ofgravity at short distance to look for extra spatial dimensions could constrain extensions of general relativity.Laser interferometricgravitational-wave observatories on Earth and in space may provide new testsof gravitational theory via detailed measurements of the properties of gravitational waves.