Moon Phases and the Solar System

Moon Phases and the Solar System

What students learn

Students learn that moon phases are caused by the Moon's orbit around Earth and the changing way sunlight reaches what we can see. Begin with Moon Phases: Orbit and Sunlight to connect sunlight to what appears bright, then use Moon Phases: Watch the Cycle Repeat to follow the full pattern across the month.

Why it matters

The Moon is one of the most familiar objects in the night sky, and its changing shape gives students a clear example of how motion and light work together. It also helps them see Earth as one planet in a much bigger system. Watch Solar System: Mercury, Venus, Earth, and Mars and Solar System: Jupiter, Saturn, Uranus, and Neptune to widen the view beyond Earth and Moon.

Learn the idea

The Moon does not make its own light. It reflects sunlight, and the portion we see changes as it moves around Earth. The planets in our solar system all orbit the Sun, and Earth is only one of eight. Ask the student to name the planets after replaying Solar System: Mercury, Venus, Earth, and Mars.

Try it

Have the student draw the Moon in four positions and label new moon, first quarter, full moon, and last quarter. Then ask them to point out where Earth fits in the solar system. If they need a reminder, replay Moon Phases: Watch the Cycle Repeat.

Parent guide

Use a flashlight, a ball, and a dark room if you want to extend the lesson at home. Ask the child what is shining and what is only reflecting light. For the planet sequence, keep it simple and repeat it aloud together.