CosmoSize: Space to Scale

Place 128 celestial objects on one touchable scale. Travel from asteroids to planets, stars, black holes and galaxies, then feel how large the universe really is.

How large is the universe? Numbers are easy to read, but cosmic scale is hard to feel.

CosmoSize arranges 128 celestial objects by real diameter in one interactive gallery. Begin with 151 meter Dimorphos, then travel through planets, stars, black holes, nebulae and galaxies.

You can:

1. Drag with one finger to travel between objects
2. Pinch with two fingers to explore changes in scale
3. Tap any object to see its diameter and science story
4. Compare celestial objects with a person, a blue whale, Voyager 1, the International Space Station and Mount Everest
5. Jump between All Objects, Deep Space, Black Holes, the Solar System and Stars
6. Explore freely in Personal mode
7. Run an automatic guided display in classrooms, homes and exhibitions
8. Switch between Chinese, English, Japanese, Korean and Spanish

No account is required. The app contains no advertising, in app purchases, analytics or cross app tracking. Core content works offline.