this post was submitted on 28 Oct 2025
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Science Memes

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[–] NaibofTabr@infosec.pub 15 points 2 weeks ago (2 children)
[–] RustySharp@programming.dev 28 points 2 weeks ago (1 children)

... when charged particles move faster than the speed of light

So that got me curious, and found this

nothing travels faster than light in vacuum, but light can be slowed down and something can travel faster than this "slower" light

Somehow I've gone through decades of life without knowing this..

[–] Ephera@lemmy.ml 6 points 2 weeks ago

What also surprised me is that the speed difference depending on medium is actually quite substantial. For example, glass has a refractive index of about 1.5.

So, the speed of light in glass is c/1.5 ≈ 200.000 km/s, i.e. 66% of the speed of light in vacuum.

[–] Swedneck@discuss.tchncs.de 1 points 2 weeks ago (1 children)

uranium itself isn't, anything will glow that colour if it undergoes nuclear fission underwater.

[–] KingGimpicus@sh.itjust.works 1 points 1 week ago* (last edited 1 week ago)

Actually uranium is a really bright yellow color. It's called "yellowcake" during processing..