Show HN: What if the speed of light was 5 km/h?

Published Sep 10, 2026 • 1:58 AM

I've always wanted to make a visualization where the speed of light was scaled down to human speeds, so that we could intuit relativistic effects with everyday objects. And here is the first version of it!

Comments URL: https://news.ycombinator.com/item?id=49637385

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Thursday, Sep 10
- Show HN: What if the speed of light was 5 km/h?You are here
Tuesday, Sep 8
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