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A comment on Gravitational waves provide dose of reality about extra dimensions. Parent comment

Re:Gravitational waves provide dose of reality about extra d... by JeromeBonnet on Monday September 17, 2018 @03:28AM (#18003864)
My understanding is that the detection order follows the underlying phenomena: first the neutron stars fell towards each other, producing gravitational waves, and only then did the stars collide, producing electromagnetic waves.
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Re:Gravitational waves provide dose of reality about extra d... by candiodari on Wednesday September 19, 2018 @10:12AM (#18024275)
As I understand it gravitational waves aren't slowed down by anything whereas electromagnetic waves interact with matter along the way, which takes some amount of time.

There isn't much matter to interact with, but not quite zero either. Something like 1e-23 of the distance had some amount of matter in it (mostly very diffuse gas clouds, nothing more).

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