Question Author
Thanks for your answers but i am not sure if I have worded my question correctly. Let me re-word the question. Imagine a large mass were suddenly to appear in space, lets say one million miles away. how long would it be before the gravitational effects be felt on earth? If the sun were to disappear and suddenly reappear it's light would take about 8 minutes to get here. But what about its gravitational field? If the answer is instantly, then the answer to my question would be much faster than light.
To take this further, If we then found a way to modulate gravity waves, (do they exist?)(dont answer that!) then instant communication could be possible over vast distances. It may be that I have been watching too much Star Trek or perhaps I have drunk too much.Where's my beer?