Shadow on the Moon can move faster than the speed of light because a shadow is not a physical object

Shadow on the Moon can move faster than the speed of light because a shadow is not a physical object by @mes on 3Speak

- Sources: - VSauce speed of dark video: - Interplanetary speed of dark thought experiment: - YouTube: - Telegram: - MES Physics: - MES Links: --- ▶ Watch on 3speak.tv

Tags: #physics #shadow #light #chessbrothers #threespeak #space #education #science #scifimultiverse

Transcript

If you, here on Earth, cast a shadow onto the moon, not an easy thing to do, that pointed from, say, point A on the moon's surface, and then you moved your finger so that the shadow moved to point B, your finger would only move a few centimeters in a fraction of a second, but the shadow it cast on the moon would move thousands of kilometers in the same amount of time. Do it right, and you're easily producing a shadow that breaks the light barrier. Point B is being cast into darkness. Sooner than a light speed message from A could warn him it's coming. What we tend to call a shadow is really just a cross-section of a three -dimensional region. The darkness you are causing only changes shape when newly unblocked light fills the previous gap. That's all a shadow is. A gap. But what if we ignored that problem by allowing the blades to simply be separately already in motion? Well, their point of intersection can still travel faster than light because it's not a physical thing.

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