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Why do physicists think gravity travels at the speed of light? | Astronomy.com

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Why do physicists think gravity travels at the speed of light?

FROM THE April 2005 ISSUE

Why do physicists think gravity travels at the speed of light?

ANTONIO MALLARINO, AMES, IOWA

Published: Friday, April 01, 2005

No experiment has yet measured the speed of gravity, but that hasn't prevented theorists from coming up with some answers. According to Newton, gravity acts instantly — that is, "action at a distance" — and so, from that viewpoint, gravity travels at an infinite speed.