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How do we know…the Sun’s core is 15 million °C?
Nobody has put a thermometer there. So where does that number come from? An investigation into observations, gravity and scientific models.
Read the comic Download PDFScience has a story
Big questions.
Science in comics.
How can we know the unreachable? Join Thermo and Zetia as they follow the clues, ideas and discoveries that lead to answers.
For curious minds, young and old.
One question, and the investigation begins!
Stories that explainScience with a sense of humourIn French and English
Follow the clues
How do we know…
Surprising questions. Curious characters. And answers that take shape, one panel at a time.
In the works
How do we know…why the Sun shines?
Where does all that light come from? Thermo and Zetia are preparing their next investigation.
The investigation comes to life
The same curiosity.
A different format.
Explore the Sun’s core temperature in a video. The characters come to life, the clues unfold… and Thermo keeps his sense of humour.
Read the comicThe idea behind the collection
Discover how
we came to know.
Every scientific finding has a story. The “How do we know…” collection follows the path from questions to knowledge, with Zetia and her companion Thermo.
We observe, reason and test models against observations. And there’s always room for the simplest questions: they’re often the best.
- A question
A mystery that makes us want to understand.
- The clues
Observations, calculations and ideas to explore.
- A reasoned answer
An explanation we can follow and discuss.