Interactive explainers · by Cary Huang and Michael Huang

The Scale of the Universe 2

A browser zoom tool that lines up objects from the subatomic to the whole observable universe so you can scroll between size scales and click objects for short notes.

One scroll takes you from the smallest particles to the size of the observable universe, and the jumps between neighbours make sizes finally feel real.

License unclear

Open htwins.net/scale2 ↗ agent.md

For your project

Official API: API unclear
Data download: No bulk download found
License: copyright, all rights (no license stated) the Scale of the Universe 2 app and site
Commercial use: Commercial use unclear
Credit: Not stated
Embedding: Embedding unclear
Using the website: Free

Read on The Scale of the Universe 2's own pages on Oct 23, 2026 · license or terms. Check the license page before you ship.

For your agent

No official API. An agent should not scrape the site: use it by hand.

No API or data export; it is a self-contained web app (ported to Pixi.js), so link to htwins.net/scale2/.
Do not copy the object art or descriptions; the site is copyrighted and gives no reuse license
Credit Cary Huang and Michael Huang when you link to it

Paste into your agent: Read https://agentgid.com/resources/scale-of-the-universe-2/agent.md before using The Scale of the Universe 2.

What you can build

A science-lesson page that links to the tool next to your own size-comparison exercises
A 'how big is it?' quiz app that sends learners to the tool for the answer

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neal.fun Each piece turns a big idea, like scale, money or time, into something you can click through in a few minutes. License unclear

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