Astronomy
25 courses·EN
Explore the sky from nearby moons and planets to stars, galaxies, and the expanding universe. Connect an explanation with the evidence used to investigate it.
Start with observation and scale before a specialized object or method. Physics provides related foundations in light, forces, and energy.
A route through the topic
Start with the introductory explanation below, then choose a focused lesson for the task or question you want to explore.
Courses in this topic
Why Earth Has Seasons: Tilt & Orbit
This training explains how Earth's axial tilt, sunlight variation, and orbital path create the four seasons for a general audience.
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15 slides·30 min