This is an interactive web tool that allows you to explore the bizarre and counter-intuitive consequences of drastically altering a fundamental constant of the universe: the speed of light. Developed by Dmitry Brant, it uses physics simulations to illustrate how special relativity would manifest if the speed of light were a mere 5 kilometers per hour, rather than its actual approximately 300,000 kilometers per second. You can see effects like time dilation, length contraction, and relativistic aberration visualized.
Editorial check
How this page is checked
Source trail
rivendell.dmitrybrant.com
External links are separated from Surfaced commentary.
Reader safety
Context before clicks
Product links and external services are not presented as guarantees.
Monetization
No affiliate flag
Ads and commerce links are kept distinct from editorial text.
Surfaced take
Why It’s Useful
This tool is incredibly useful for anyone curious about physics, relativity, or simply wants to engage in mind-bending thought experiments. It demystifies complex concepts by providing tangible, albeit simulated, visual evidence of their effects. Unlike reading a textbook, you can actively play with parameters and see the results firsthand. It’s an excellent resource for students, educators, or anyone who appreciates the beauty and strangeness of the cosmos. It makes the abstract principles of special relativity accessible and intuitive.
In everyday life
When you’d actually reach for this
Feeling stuck on a physics problem about relativity? This tool can help you visualize time dilation effects for a spaceship traveling at near-light speeds. Or, if you're a writer crafting a sci-fi story, you can use it to understand the visual distortions your characters might experience in a universe with different physical laws.
More from Hidden Gems
View all →
Enjoyed this? Get five picks like this every morning.
Free daily newsletter — zero spam, unsubscribe anytime.