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Gravity is classically characterised by space time geometry as a gravitational field.
General Relativity holds true when the distances involved are greater than the Planck-Wheeler Length. (This is the shortest distance that can be accurately measured).
When distances are shorter than the Planck-Wheeler Length then General Relativity breaks down, hence the search for a quantum gravity theory.
Now, the holy grail of physics is the unification of Gravity, Weak, Strong Nuclear Force and the Electromagnetic Force.
Now, Gravitational Waves or perturbations in the gravitational field is the domain of the graviton. This hypothetical particle has zero rest mass ( I didnt know they non catholic )
Gravitational waves can be detected by 4 methods.
1. Extremely low frequency gravitational waves left their imprint on the microwave cosmic background.
2. Very low frequency gravitational waves influence radio waves propogated by pulsars.
3. Low frequency gravitational waves influence on radio transmissions between earth and interplanetary space craft. This will be replaced in 2012 by LISA or Laser Intereferometer Space Antenna.
4 High frequency gravitational waves measured by earth based detectors ie LIGO or Laser Interferometer Gravity Obsevatories.
Seems as though the Michelson-Morley apparatus has grown up and forgotten about the ether
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