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.
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.
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.
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.
The shadow has no FTL information here. Watch https://youtu.be/JTvcpdfGUtQ
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.
The edge of the shadow can move across the surface of an object an essentially infinite speed. That’s the speed of dark
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.