Thinking of Gravity as a Wave

Remember that wave-partical duality thing? Just as electromagnetic radiation (light) and electrons can be thought of both as waves and particles, supposedly so could gravity. Just as a particle of light is called a photon, a particle of gravity is called a graviton. (Which could also be a wave)

The definition of a graviton is:
The messenger particle which carries the gravitational force. It plays a part in quantum gravity analogous to the role of the photon in electromagnetic interactions described by QED. (From Q is for Quantum by John Gribbin)

For fellow 211 students, to get a better feel (if one can be gotton) for wave-particle duality, I suggest reading the explanation in Q is for Quantum, an Encyclopedia of Particle Physics by John Gribbin. This is really an excellent resource for all sorts of physics questions you may have and it's just good leasure reading as well!