From an atom to the edge of the universe.
Zoom through 62 powers of ten. Cosmo puts 44 real things side by side at their true size, from quarks and viruses to you, Mount Everest, the Sun and whole galaxies.
Zoom the universe
Everything is drawn at its real size compared to its neighbours.
Drag sideways, scroll, pinch or use the slider. Left is smaller, right is bigger.
How many times bigger?
Pick any two things and see how they compare.
How to use Cosmo
No sign-up. Works on phones, tablets and smart boards.
Zoom
Drag, scroll or pinch to move from tiny to huge. The card shows what you are looking at.
Jump or tour
Tap a shortcut like Earth or Galaxy, or press Auto tour and watch the whole journey.
Compare
Pick two things to see how many times bigger one is, with an easy 1 cm example.
Questions
Are the sizes real?
Yes. Sizes come from standard science references. Some, like the quark and the Oort cloud, are estimates and are marked so.
Why are some things measured by height and others by width?
We use the most natural size: height for people, towers and animals, width for planets, stars and galaxies.
Can I use it in class?
Yes. Cosmo is free for teachers and students. Put it on a projector and press Auto tour.
Does it work offline?
After the first visit, yes. Install it from your browser menu to open it like an app.