When a gravitational disturbance occurs, how fast does the ripple in space-time travel in empty space?
+5 Please do not tell anyone where you heard this answer. There are some that would be upset with me telling you these things. But you should know. A gravitational disturbance can be artificially produced with a magnetic flux inducer. It works with a Magnetron tube to produce a microwave laced with a magnetic field. The practical aspect is that a hole is punched into the very fabric of space and with this hole produce by the micro/magnetic field a worm hole is produced. I hope I have brought this down to a 2009 understanding. Let me know if this is understandable and I will share more.