Help students grasp the true scale of space with this engaging Scale Model Solar System STEM Lab. In this hands-on astronomy activity, students model planetary distances using a measuring tape or string to explore just how vast the solar system really is.

Rather than focusing on planet size alone, this lab emphasizes distance, scale, and proportion, helping students confront one of the most common misconceptions in space science: that planets are evenly spaced and close together. As students lay out the model, they quickly discover that most of the solar system is empty space — and that the outer planets are incredibly far from the Sun.

An optional extension compares planet and Sun sizes versus distances, reinforcing why astronomers must use different models to represent size and distance accurately.

This lab is low-prep, highly visual, and flexible for indoor or outdoor spaces. It fits easily into a single class period and works well as a core lesson, enrichment activity, or STEM lab rotation.

What’s Included

✔ Complete 60-minute lesson plan
✔ Student worksheet with calculations, observations, and CER prompt
✔ Distance data table for all eight planets
✔ Optional extension comparing Sun and planet sizes vs. distances
✔ NGSS- and TEKS-supportive astronomy content
✔ Ready-to-print classroom resource

Skills & Concepts Addressed

• Scale, proportion, and quantity
  
• Astronomical distance modeling
  
• Scientific use of models
  
• Data analysis and pattern recognition
  
• Claim–Evidence–Reasoning (CER)
  
• Earth & space science literacy
  

⭐ Perfect For

• Middle school astronomy units
  
• Earth & Space Science
  
• STEM labs and stations
  
• Math-science integration
  
• Enrichment or review lessons
  
• Sub plans