Discover the wonders of space just like Galileo! In this fun, hands-on STEM activity, kids can build their own simple telescope and use it to observe the Moon. This easy project introduces early astronomy and celebrates Galileo Galilei’s famous invention that changed how we see the universe.
Simple Telescope Project for Kids
A telescope is a science tool that collects and magnifies light so we can see faraway objects—like the Moon and stars—more clearly. The first telescope was invented in the early 1600s, but Galileo Galilei was the first to point one toward the sky.
With his telescope, Galileo discovered the moons of Jupiter, the rough surface of the Moon, and the phases of Venus, proving that Earth wasn’t the center of the universe.
When kids make this DIY telescope, they’ll see how light travels through lenses (or, in this case, clear material) and learn that magnification depends on how far apart the “lenses” are.
- Field of Science: Astronomy, Physics, Engineering
- Grade Level: Grades 2–5
Concepts Explored:
- Light and magnification
- Observation and data recording
- The tools scientists use to study space
Supplies Needed:
- 2 pieces of cardstock
- Tape
- Clear plastic wrap
- Rubber band
- Markers or stickers for decorating
- Moon Observation printable
How to Make the Galileo Telescope
Step 1: Roll each sheet of cardstock into a tube and tape securely. Make one tube slightly smaller so it can slide inside the other telescope.
Step 2: Cover one end with plastic wrap and secure it with a rubber band to act as a lens.
Step 3: Decorate your telescope using markers, paint, or stickers.
Step 4: Slide the smaller tube in and out to adjust focus.
Step 5: Go outside on a clear night to observe the Moon and record your observations.
💡 Tip: Choose different nights to compare how the Moon changes shape or brightness.
Moon Observation Activity
Use the Moon Observation sheet to record what you see through your telescope each night for moon observations.
- Draw the Moon’s shape (crescent, half, full).
- Note any visible light and dark spots.
- Describe whether the Moon looks smooth or bumpy.
Simple DIY Telescope Science Information
Telescopes use curved glass lenses or mirrors to bend light rays, focusing them into an image that appears larger. Galileo’s version was called a refracting telescope because it used lenses to bend light.
In this simplified version, kids create two sliding tubes to mimic the focusing action. While this craft telescope doesn’t magnify much, it demonstrates the engineering concept of how a real telescope functions and introduces the idea of scientific observation.
Explore Light with a Simple Spectroscope
🔎 Once your young astronomers have mastered observing the Moon, try this DIY Spectroscope project to explore light itself!
A spectroscope separates light into a rainbow of colors, called a spectrum. Scientists use this tool to study what stars and planets are made of, because each element emits a unique pattern of colors (like a fingerprint for light).
NGSS Guiding Questions
| NGSS Question | Concept Focus |
|---|---|
| How do tools help scientists make discoveries? | Telescopes extend human vision, allowing us to study distant objects in space. |
| What can we learn by observing the Moon? | Observations reveal surface features like craters, shadows, and phases. |
| How does light help us explore space? | Light allows us to see celestial objects and gather information about them. |
Free Printable Telescope Project and Moon Tracker Sheet
Learn how to make a simple telescope like Galileo and track the moon phases each night.
Related Moon and Space Activities
🔎 Check out our complete Astronomy for Kids collection here.
- Make a Moon Phases Fold-Out Book to connect observations with the lunar cycle.
- Use Oreo cookies to model the phases of the moon.
- Build a simple sundial to explore how the Sun’s position changes throughout the day.
- Try a Solar System STEM Challenge and map planet distances from the Sun.
- Combine science and art to create this Watercolor Galaxy.
Printable Science Packs for Kids
Visit our SHOP for easy-to-print STEM and science lesson plans for the whole year. Or join us in the Little Bins Club.
