Beginner · 5 lessons
Astronomy Fundamentals
Build a mental map of the cosmos, from nearby worlds to the light arriving from distant galaxies.
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Explore track Follow your curiosity.
Each track contains five lessons and a 20-question knowledge quiz. Start anywhere, or begin with Astronomy Fundamentals.
Beginner · 5 lessons
Planets and Moons
Compare worlds, investigate oceans beneath ice and learn how we discover planets around other stars.
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Explore track Intermediate · 5 lessons
Stars and Stellar Evolution
Follow matter from cold clouds through fusion, stellar evolution and compact remnants.
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Explore track Advanced · 5 lessons
Galaxies and Cosmology
Connect galaxy observations with expansion, invisible matter and the early universe.
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Explore track Intermediate · 5 lessons
Rockets and Space Engineering
Understand propulsion, orbital motion and the engineering that keeps spacecraft working.
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Explore track Beginner · 5 lessons
Space Exploration
Read the evidence from exploration and learn how scientific missions turn questions into measurements.
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