Light and gravity travel at the same speed, but don't arrive together | Hacker News

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		Light and gravity travel at the same speed, but don't arrive together (bigthink.com)
		3 points by Brajeshwar 3 months ago \| hide \| past \| favorite \| 1 comment

FrankWilhoit 3 months ago [–]

Spacetime has no refractive index. Matter (no matter how sparse) does.

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