Astronomy
27 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.
15 slides·30 min
Apparent vs Absolute Magnitude
This training teaches learners to distinguish apparent from absolute magnitude and understand how astronomers compare star brightness.
14 slides·28 min
Reading the H-R Diagram: Classifying Stars
Learn to read and interpret the Hertzsprung-Russell diagram to classify stars by luminosity, temperature, and evolutionary stage. Ideal for astronomy students and science educators.
14 slides·28 min