Crimson Moon SlidesCrimson Moon The Mystery of the Red Eclipse Think Like a Sky Watcher When you see a shadow on the ground, what color is it usually? Is a shadow always black? The Lunar Eclipse Watch & Learn Embedded media Pay close attention to why the shadow isn't black! (Clip 1:37 - 2:08) Science Secrets Lunar Anything that has to do with the Moon. Eclipse When one object in space blocks another object. Atmosphere The layer of gases (air) that surrounds the Earth. Refraction When light bends as it passes through something (like air or water). The Cosmic Line-Up Sun Earth Moon During a Lunar Eclipse, Earth gets right smack dab between the Sun and the Moon! Earth's Magic Lens Earth’s atmosphere acts like a giant lens or filter. White sunlight hits our atmosphere. The light bends around the Earth. Only the Red Light makes it through to hit the moon! Light Bending Effect Lab: Bending Light Supplies • Clear water container • Flashlight • A splash of milk • White paper (the "Moon") Procedure 1. Shine flashlight through clear water. 2. Add a tiny splash of milk (the "Atmosphere"). 3. Look at the light from the side and the end. 4. Does the color change? Sky Watcher Chat If Earth had NO atmosphere, what color would the eclipse shadow be? Why do you think only people on the night side of Earth can see it? Is it safe to look at a Lunar Eclipse? Why?
Crimson Moon Teacher GuideTeacher Guide: Crimson Moon Lunar Eclipses & Refraction | Grades 2-4 Duration 40-50 min Lesson Objective Students will investigate why the moon turns red during an eclipse by exploring light refraction (bending) through a simulated "atmosphere." Materials Needed Rectangular containers Water & Milk Bright flashlights White paper/Cardstock Prisms (optional) Slide Deck 1. Warm-Up: The Color of Shadows (5 min) Show Slide 2. Ask: "Is a shadow always black?" Prompt students to think about the shadows they see outside. Do they ever look different at sunset? Video Spotlight: Play the Lunar Eclipses clip from 1:37 to 2:08. Focus on the explanation of why the shadow isn't black. 2. Discussion: Earth's Atmosphere (5 min) Use Slides 4-6 to define key terms. Explain that our atmosphere isn't just "empty space"—it's full of gases that act like a giant lens. Refraction: The fancy word for light bending. Atmosphere Filter: Explain that short wavelengths (blue) get scattered away, while long wavelengths (red) pass through and bend toward the moon. 3. The Experiment: "Bending Light" (20 min) Setup: Group students and provide a clear container filled 3/4 with water. Step A: Clear Water Simulates: Space (no atmosphere) Shine the flashlight through the container onto the white paper. The light remains white. Step B: Cloudy Water Simulates: Earth's Atmosphere Add ONE DROP of milk. Stir. Shine the light again. Look for a warm, orange-red tint on the paper and a blue tint in the water itself. Teacher Tip: The milk particles represent the gases in our atmosphere. They scatter the blue light (making the water look blue) while letting the red light pass through to the "Moon" (the paper). 4. Closure: Cause & Effect (10 min) Students complete the "Crimson Moon Tracker" worksheet. They should be able to explain the chain of events leading to a red moon. Deep Dive Questions Q: Why is the sky blue? A: It's the same science! The atmosphere scatters the blue light everywhere, while the red light keeps going straight to the moon during an eclipse. Q: What if the air was dirty? A: Volcanic ash or smoke in the atmosphere can actually make the moon look even darker red or even brown!
Crimson Moon WorksheetCrimson Moon Tracker Mission: Discover the Red Eclipse Name: Date: 1. Sky Watcher Words Match the word to its meaning by drawing a line. Lunar Atmosphere Eclipse Refraction When one space object blocks another. Anything having to do with the moon. When light bends through air or water. The layer of gases around the Earth. 2. Experiment Log: Bending Light Observation 1: Clear Water Draw what the light looked like on the paper. Observation 2: Cloudy Water (Milk) Draw what the light looked like on the paper. What happened to the color of the light after you added the "atmosphere" (milk)? 3. The Crimson Chain (Cause & Effect) Fill in the boxes to show why the moon turns red! The Cause Sunlight hits Earth's Atmosphere The Action Light __________ The Effect The Moon turns __________ Circle the correct answer: Lunar eclipses are safe to look at. Lunar eclipses are dangerous for your eyes.
Crimson Moon Answer KeyAnswer Key Crimson Moon Tracker 1. Sky Watcher Words Lunar Anything having to do with the moon. Atmosphere The layer of gases around the Earth. Eclipse When one space object blocks another. Refraction When light bends through air or water. 2. Experiment Log Expected Observations: Clear Water: The light on the paper should look white or slightly yellowish (color of the flashlight bulb). Cloudy Water: The light on the paper should look distinctly warm, orange, or reddish. The water itself might look slightly blue from the side. Color Change Answer: The light turned red/orange because the "atmosphere" (milk) scattered the other colors and only let the red light pass through. 3. The Crimson Chain CAUSE Sunlight hits Atmosphere ACTION Light Bends / Refracts EFFECT The Moon turns Red / Crimson Safety Check Lunar eclipses are safe to look at.
