Astronomy
25 courses
Science
71 courses·EN
Explore scientific ideas by the system you want to understand, from atoms and living cells to Earth and the night sky.
Choose Astronomy for objects, observation, and cosmic scale; Physics for forces, waves, and energy; or Chemistry for atoms, bonds, and matter.
Biology & Ecology examines living systems, while Earth Science connects materials, atmosphere, and physical cycles. Mathematics & Scientific Thinking provides a separate route through patterns, chance, and evidence.
Explore subtopics
Physics
12 courses
Chemistry
8 courses
Biology & Ecology
12 courses
Earth Science
11 courses
Mathematics & Scientific Thinking
3 courses
FAQ
- How should I choose between the science courses?
- Start with the question or concept you want to understand. Read the course description for scope, and choose an introductory lesson before a narrower topic when you need the background.
- How do I choose the right level?
- Read the individual course description and opening lesson for its scope and prerequisites. Select a foundation course when the terms are unfamiliar, or a focused course when you have a specific task.
- Does every course require an assessment?
- Assessment and question options depend on the individual course configuration. Check the course page and player for the requirements and controls available in that lesson.