• At the speed of light. If it did not, you could get the the appearance of an accelerating object coming from a different direction from its gravity (as sound waves do). That, it would seem to me, could be used to play merry hell with causality. Another way to look at it is to say that the ripple is carried by gravitons, which are massless (or they would attract each other, to the confusion of all) and therefore must travel at the speed of light.
  • The speed of light c =299,792,458 meters per second (m/s). That is why if the sun disappeared, the Earth would continue to orbit nothing for eight minutes.

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