Physics & motion · A guided course

Gravity and orbits

From a falling feather to worlds circling a star.

Find out why astronauts float, what keeps a satellite moving around Earth, and how gravity connects planets, moons, and tides. Test predictions with an orbit model and learn when a simple explanation needs more detail.

5 lessons37 min of lessons + 6 min challengeBeginner

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No prerequisites · Learn at your own pace

NASA/DSCOVR EPIC team · Image source ↗

Learning points

— earned

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

5 lessons

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

0 of 5 lessons complete

— / 475 pointsEarned in this course

Put it all togetherThe gravity and orbits challenge5 questions · 6 min · Final review

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

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