Re: What is the speed and wavelength of gravity waves?

Gravity waves travel at the speed of light.  The wavelength
depends on the frequency:

wavelength = (speed of light) / frequency

For example, consider two newtron stars orbiting each
other with a period of 1000 seconds (about 20 minutes).
That is a frequency of 1/1000 Hz, and the wavelength
of the resulting gravitaitonal waves would be
(3E8 m/s)/(1E-3 Hz) = 3E11 m.  

Gravity waves are a prediction of the Gneral Theory of
Relativity.  We have pretty good
indirect evidence for the existence of gravitational
waves, but have not yet succeeded in directly detecting
them.  The Laser Interferometric Gravitational Observatory
(LIGO) is nearing completion.  This large project may
provide the first direct detection of gravity waves within
the next few years, with luck.