EMR affects matter,by causing atoms to move around, and knocking electrons out of their orbits, but it doesn't have an effect on space-time itself.
But remember, when gravity waves shake something, what is being shaken is space itself. For example, if you were in a space ship hit by a powerful gravity wave, it wouldn't feel like the ship was being shaken, because everything inside the ship would be shaken in exactly the same way. Its like the crew of a spaceship falling towards a planet, accelerating in a gravitational field, feels no acceleration forces. In fact, they have no way of knowing that they are accelerating unless they look out a window. There is no measurement they can make inside the ship to indicate they are falling, faster and faster, toward the planet.
Space/Science » in reply to EMR seems to be a bit different.
That's right.
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