Re: Is dark matter and space-time the same thing?

"An international team of astronomers using NASA's Hubble Space Telescope 
has created the first three dimensional map of the large-scale 
distribution of dark matter in the universe."  For more, see  
http://www.nasa.gov/mission_pages/hubble/news/clumpy_darkmatter.html

Space-time and dark matter are relevant to the study of gravity, but do 
not explain gravity.

More on dark matter is located at  
http://www.space.com/scienceastronomy/astronomy/dark_matter_sidebar_010105.html

Quantum field theory has it that the graviton mediates the force of 
gravity.  Discovery of gravitons will move science farther down the road 
of understanding how the force of gravity is able to influence distant 
objects.

A good reference for the graviton is at  http://en.wikipedia.org/wiki/Graviton

More on the graviton is located at  http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980319b.html

An additional site to check is  http://imagine.gsfc.nasa.gov/docs/ask_astro/relativity.html

Thanks for your question.

sid