Galaxies and cosmology · A guided course

Dark matter and dark energy

Infer what cannot be seen—and test the inference.

Use galaxy motions, gravitational lenses, colliding clusters, supernova distances, and particle searches to compare dark-sector explanations. Work through models while keeping observations, assumptions, and unresolved questions distinct.

6 lessons60 min of lessons + 8 min challengeAdvanced

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Suggested preparation is listed in the course · Start whenever you’re ready

Image: NASA, ESA, CSA, STScI, CXC; Science: James Jee (Yonsei University, UC Davis), Sangjun Cha (Yonsei University), Kyle Finner (Caltech/IPAC) · Image source ↗

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Correct answer: +10
Lesson complete: +25
All lessons complete: +100
Final challenge: +50

Earn each reward once. Retries never cost points.

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Inside this course

6 lessons

Each lesson builds on the last. Read the story, explore the sources, and check your understanding.

0 of 6 lessons complete

— / 530 pointsEarned in this course

Put it all togetherBuild a defensible dark-sector claim5 questions · 8 min · Final review

No account is needed to learn. Your correct answers keep their earned rewards.

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