Have you ever wondered why stars rise and set, or why the sky changes from season to season? It all comes down to how Earth spins and orbits the Sun. Because of Earth’s tilt, different parts of the planet get more or less sunlight at different times of year—that’s what gives us seasons. (Most people think it’s because the Earth gets closer or farther from the Sun, but that’s actually a common misconception.)
As we orbit, our view of the night sky shifts too, so the stars you see in summer are totally different from the ones in winter. The Moon’s changing shape? That’s just sunlight hitting it from different angles as it moves around Earth. And depending on your location on the planet, the stars may appear to move in arcs, rise and set at different angles, or never set at all. As you explore these ideas, you’ll begin to uncover the patterns behind the sky’s motion—and why it’s been such a mystery for thousands of years.
Watch the Science Lesson
VIDEO COMING SOON! (After Live Class is completed.)
Do the Assignments
Homework
Each week, you'll be assigned a set of discussion questions, quantitative problems, and quiz questions. Begin with the discussion questions to make sure you're understanding the material presented in class. Then move into the homework problems., skipping any that are challenging or you’re not sure how to start (saving them for after you’ve worked on other problems first.) Continue working on these problems each day until you’ve completed the set.
Space Podcast
Each week, students choose a space-related podcast episode to listen to and write a short summary in their journal. These reflections help students stay connected to current science news while developing their ability to explain scientific concepts in their own words. (Suggested podcasts are in the Astronomy Info Packet.)
Astronomer Spotlight
Students will research and present a 5-minute talk and poster about a notable astronomer (past or present), highlighting their discoveries, impact on science, and personal journey. This project includes both a visual component (printed or hand-written poster) and a brief presentation. Check the main course Syllabus for due date for this month's Astronomy Spotlight project.
Lab Project Activity
This week is full of hands-on fun! Below you'll find several short videos that illustrate the seasons, phases, and scales of the solar system, galaxy, and universe. Download your lab project, and use the step-by-step instructional videos to walk you through every part of the assignment.