# speed of gravity = c

by wolram
Tags: gravity, speed
 PF Patron P: 3,666 it has been reported that the speed of gravity = c does this mean that an object traveling at c would not feel the efects of gravity? ttayeg
Mentor
P: 21,652
 Originally posted by wolram it has been reported that the speed of gravity = c does this mean that an object traveling at c would not feel the efects of gravity? ttayeg
Well... since an object can't travel at C, its kinda a pointless question. LIGHT however, travels at C and is affected by gravity (or rather the curvature of space that gravity creates).
 Sci Advisor P: 2,501 Right, the path of a photon is affected when it travels through an area of space-time that has already been curved by gravity. However, if a photon were to pass through a relatively "flat" area of space-time and, after it had passed, a massive object (such as a planet) suddenly materialized in that space, the gravity from that planet would (theoretically) never effect that photon. The sudden appearance of the planet would send a huge gravity wave out in all directions, this wave would propagate at lightspeed, and never "catch up" to anything traveling at lightspeed the had already passed.
P: 1,341

## speed of gravity = c

Greetings !
 Originally posted by wolram it has been reported that the speed of gravity = c ...
I believe the current proven possible range
was reported to be something like 0.8 - 1.05 c.
(This could be outdated or slightly inaccurate info.)
More accurate tests are still required to
make sure that reality "follows" the laws of theory.

As for the question - since no particle with rest
mass can reach c, it is somewhat pointless to ask