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A comment on SpaceX Starlink average speedtest is 42.3Mbps down / 9.7 Mbps up. Parent comment

Re:SpaceX Starlink average speedtest is 42.3Mbps down / 9.7 ... by peteretep on Thursday August 27, 2020 @06:57AM (#24292336)
> It’s quite easy to “break” the speed of light in fiberoptic glass.

I don’t understand this, why? Does light travel faster than the speed of light in fibre optic glass?

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Re:SpaceX Starlink average speedtest is 42.3Mbps down / 9.7 ... by Dylan16807 on Thursday August 27, 2020 @07:24AM (#24292538)
"the speed of light in fiberoptic glass" is the thing being broken.
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