About

How Fast Is is a passion project exploring the full scale of velocity in the universe — from the imperceptible drift of tectonic plates to the blinding speed of light itself.

Inspired by Scale of the Universe and similar projects, we wanted to create the same sense of awe but for speed — something that touches everything from biology to astrophysics.

A note on accuracy

This website was built using Claude AI. AI can — and sometimes does — get things wrong. The speed values and descriptions have been cross-referenced with sources like Wikipedia and NASA, but if something looks off please double-check before quoting it.

The data

Speeds are sourced from established references including Wikipedia, NASA, and published sports statistics. Speeds are typically peak or well-cited typical values and can vary depending on conditions.