Part 1 of 5 · freeIntroduction
You feel the wind without seeing it: branches move, hair flies. Dark matter is a little like that on the scale of the cosmos. It does not shine, it does not reflect light, and it blocks no ray. We only “see” it through what it moves.
It seems to make up about 27% of the universe, five times more than all the ordinary matter: stars, planets, gas. Without it, galaxies would spin too fast to hold together.
The rest is in the Sophia app.The remaining parts, the open-book quiz and the full glossary. Free to start; Premium unlocks everything.
- 2Stars moving too fast at the edge
- 3What is it made from? The search goes on
- 4And dark energy, the other mystery
- 5Overwhelming evidence, no particle
Open-book quiz9 questions whose answers are in the text.
Glossary10 terms explained in a tap.
30 languagesThe same course, from French to Japanese.
