“That light isn't actually making headway outwards, it's trying to swim upstream and failing against the faster-than-light cascade of space-time… If we try to accelerate in either direction up or down, we just quicken our demise. Best just to fall. It's the last mercy granted by the black hole.”
PBS Space Time · Ideas & Essays · November 2026
Context
Matt O'Dowd describes what an observer would experience after falling through a black hole's event horizon. Even light pointed outward is dragged inward, and no direction of travel helps.
Transcript
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…coordinate. But it's no longer time-like. You can traverse it in either direction, making it space-like. Doing so isn't actually traveling in time, even though there's a sense of past events in one direction, the collapsing star, and future events in the other, everything that fell into the black hole after us. But remember that our future light cone actually just points towards the singularity. If we try to accelerate in either direction up or down, we just quicken our demise. Best just to fall. It's the last mercy granted by the black hole. It transports us to our doom by the slowest path, unless we resist. Below the event horizon, there's still a sense of spatial upness and downness. However, the old radial dimension isn't space-like, it's time-like. Every photon that reaches us was emitted at
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