Science · Grade 6

Active learning ideas

Modeling the Solar System

Active learning works for modeling the solar system because students need to physically engage with scale to confront the vast emptiness of space and the relative sizes of planets. Moving beyond flat diagrams forces learners to confront proportions they would otherwise dismiss as abstract numbers.

• Ontario Curriculum Expectations
• MS-ESS1-3

• 35–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Project-Based Learning
• 45 min · Small Groups

Schoolyard Walk: Linear Scale Model

Choose a scale where the Sun is a basketball at one end of the field. Calculate and mark planet positions with cones or balls based on average distances. Students walk the path in groups, measuring steps between planets and noting the vast gaps. Conclude with a class chart comparing model to real data.

Design a scale model that accurately represents the vastness of space.

Facilitation Tip

During the Schoolyard Walk, walk backward from the Sun so students can see how far back they need to place Mercury, creating a sense of the scale before they measure.

What to look for

Students present their scale models to a small group. Peers use a checklist to evaluate: Is the scale factor clearly stated? Are the relative sizes of at least three objects represented proportionally? Are the relative distances between at least two objects shown to scale? Peers provide one suggestion for improving accuracy.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 02

• Project-Based Learning
• 35 min · Pairs

Pairs Blueprint: 2D Scale Drawing

Pairs use planetary data to calculate diameters and distances on graph paper, drawing the solar system to scale on a long roll of butcher paper. Label sizes and orbits accurately. Pairs present their drawings, explaining scale choices and limitations.

Evaluate the challenges of creating an accurate scale model of the solar system.

Facilitation Tip

For the Pairs Blueprint, provide grid paper and colored pencils, and ask students to label each planet with its scaled diameter in millimeters.

What to look for

Provide students with a table of planet diameters and distances from the Sun. Ask them to calculate the scaled diameter of Jupiter and the scaled distance of Mars from the Sun, using a Sun diameter of 10 cm. Collect and review calculations for accuracy.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 03

• Project-Based Learning
• 50 min · Small Groups

Small Groups Build: Hanging Mobile

Groups paint and size foam balls for planets relative to a central Sun ornament. Attach with strings scaled to orbital distances, balancing the mobile. Test by spinning gently to simulate orbits, then critique scale accuracy in group shares.

Critique common misconceptions about the relative sizes and distances of planets.

Facilitation Tip

When students Build a Hanging Mobile, have them hang the Sun first, then measure and adjust the strings for each planet to maintain scale.

What to look for

On an index card, students write down one common misconception about the solar system's scale (e.g., planets are close together) and explain how their model helps to correct this misconception.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

Activity 04

• Project-Based Learning
• 40 min · Whole Class

Whole Class Simulation: Human Solar System

Assign students roles as Sun and planets. Position them to scale across the gym or field using measured tapes. Rotate students to show orbits, discussing feelings of distance. Record observations on a shared digital map.

Design a scale model that accurately represents the vastness of space.

Facilitation Tip

In the Human Solar System simulation, assign students to hold signs with planet names while others measure distances with a trundle wheel to ensure accuracy.

What to look for

Students present their scale models to a small group. Peers use a checklist to evaluate: Is the scale factor clearly stated? Are the relative sizes of at least three objects represented proportionally? Are the relative distances between at least two objects shown to scale? Peers provide one suggestion for improving accuracy.

• Apply
• Analyze
• Evaluate
• Create
• Self-Management
• Relationship Skills
• Decision-Making

A few notes on teaching this unit

Teachers should begin with a quick data dump of planetary diameters and distances, then let students struggle with scale choices before offering guidance. Avoid giving them the 'correct' scale; instead, let them recalibrate after measuring their first attempt. Research shows that students who revise their models based on measurement data retain spatial understanding better than those who follow pre-set instructions.

Successful learning looks like students creating models where planet distances and sizes match scaled data, discussing why some scale choices don't fit in classrooms, and using measurements to justify their model designs. Students should express surprise at how empty space is compared to textbook images.

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Watch Out for These Misconceptions

• During the Schoolyard Walk, watch for students placing planets in tight clusters or assuming inner planets are similar in size to outer planets.

  Have students use the 1-meter Sun as a reference to measure each planet's scaled diameter with a ruler, then place the planets at their calculated distances. Ask them why their initial placements don't match the data.

• During the Pairs Blueprint, watch for students drawing planets as equally spaced circles regardless of data.

  Require students to calculate each planet's scaled diameter in millimeters and label it on their drawing. Then, have them measure and mark distances from the Sun using a ruler, forcing a comparison between size and distance.

• During the Small Groups Build, watch for students making the Sun only slightly larger than Jupiter.

  Provide a 10 cm ball for the Sun and challenge students to scale Jupiter proportionally. When they struggle, ask them to measure the ball's diameter and compare it to the diameter of a pea for Earth, then adjust the mobile accordingly.

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Methods used in this brief

• Project-Based Learning