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[-] LovableSidekick@lemmy.world 3 points 1 day ago

Very eloquent explanation. The one glitch I must point out is that the shadow (or absence of light) can't move faster than light, because the shadow is information and information can't travel faster than light. If it could, you could use a sequence of shadows, coded by length and spacing, for FTL communication.

[-] dondelelcaro@lemmy.world 16 points 1 day ago

The shadow moving is more akin to bandwidth of transmission rather than speed of transmission. You still have to wait for the photons (so speed of light) for the information to arrive, even if the "speed" of the shadow appears FTL.

[-] ryannathans@aussie.zone 4 points 20 hours ago* (last edited 20 hours ago)
[-] LovableSidekick@lemmy.world 2 points 4 hours ago

Ok I watched the video and I get that no information is travelling FTL. "Speed of darkness" is misleading tho, because the light at the shadow's edge has the same "speed" as the shadow.

[-] ryannathans@aussie.zone 1 points 2 hours ago

The edge of the shadow can move across the surface of an object an essentially infinite speed. That's the speed of dark

this post was submitted on 25 May 2026
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