Firstly apologies to Hal Clements.
Maybe I’m missing a trick here, but surely gravitational waves would exibit recognisable characteristics such as, say Doppler effect.
I don’t see why Doppler shift wouldn’t cause the celestial object to accelerate, as that shift would give rise to a greater gravitational attraction from the half of the universe that the object was approaching, compared with the half of the universe that it was receding from.
Would this acceleration, if any, be measurable? I’m not aware of any avenues of research that seek to substantiate or refute this.
Maybe gravity is a special case and there is no association between Doppler Effect and gravitation waves. Any answers out there?

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