Changes

*Quantum mechanics has not yet successfully been applied to the gravitational interaction.  At huge energy scales, where both quantum mechanics and general relativity are required to describe the system, the known laws of physics break down. Attempts to discover a quantum theory of gravity have led to [[string theory]] and [[m-theory]], but to date neither have permitted the design of a technologically feasible experiment to verify them.

*Quantum mechanics has not yet successfully been applied to the gravitational interaction.  At huge energy scales, where both quantum mechanics and general relativity are required to describe the system, the known laws of physics break down. Attempts to discover a quantum theory of gravity have led to [[string theory]] and [[m-theory]], but to date neither have permitted the design of a technologically feasible experiment to verify them.

*General relativity predicts the existence of gravitational waves, but none have been conclusively detected.  Due to the weakness of the gravitational interaction, extremely sensitive detectors are required.  The [[LIGO]] project is an example of current efforts to detect such waves.

*General relativity predicts the existence of gravitational waves, but none have been conclusively detected.  Due to the weakness of the gravitational interaction, extremely sensitive detectors are required.  The [[LIGO]] project is an example of current efforts to detect such waves.