# How to Make a 3-D Model of the Solar System for a Project

Written by rachel asher
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Making a 3-D model of the solar system is a school project that hasn't changed over the years, except that Pluto is no longer considered a planet. The 3-D model helps students understand the scale and orientation of something much bigger than themselves, and begin to learn why the Earth's distance from the sun makes it the best candidate for creating and sustaining life. Though making a 3-D model of the solar system is a suitable project for young children, it's also a useful educational tool for adolescents and adults.

Skill level:
Easy

### Things you need

• String
• Thumbtack
• 20-inch-diameter piece of cardboard
• Pencil
• Scissors
• Compass
• White construction paper
• 8-inch-diameter paper circle for the sun
• .2-inch-diameter paper circle for Mercury
• .7-inch-diameter paper circle for Venus
• .7-inch-diameter paper circle for Earth
• .4-inch-diameter paper circle for Mars
• 7.7-inch-diameter paper circle for Jupiter
• 6-inch-diameter paper circle for Saturn
• 2.5-inch-diameter paper circle for Uranus
• .1-inch diameter paper circle for Neptune
• Black marker

## Instructions

1. 1

Punch the thumbtack through one end of the string and into the centre of the cardboard. Hold your pencil against the loose end of the string and pull the string taut. The pencil point should be perpendicular to the cardboard. Keeping the string taut against the pencil, move the string clockwise and draw a circle on the cardboard.

2. 2

Cut 1 inch off the string. Hold your pencil against the end of the string and draw another circle. Repeat this step three more times, so you will have drawn four circles by the end of this step. These will represent the orbits of Jupiter, Saturn, Uranus and Neptune.

3. 3

Cut 2 inches off the string and draw the next circle. This will leave a 2-inch gap between the four outer planets and the four inner planets. The gap is where the asteroids orbit.

4. 4

Cut off 1 inch of string, hold your pencil against the end and draw another circular orbit. Repeat this step three more times. These are the orbits of Mars, Earth, Venus and Mercury.

5. 5

Punch one hole somewhere along each orbit, and one hole in the centre of the cardboard. This is where you will hang the planets from, so disperse the holes around the cardboard.

6. 6

Use a compass to draw the diameters of eight planets and the sun. Cut the planets out of oak tag. Punch one hole along the outer edge of each planet and the sun.

7. 7

Paint or colour the planets and sun with marker. Decide what colours to assign the planets. When the paint dries, label the planets with black marker.

8. 8

Cut nine 10-inch pieces of string. Tie one end through the holes in the planets and sun. Loop the other end through the holes in the cardboard with the orbits drawn, and tie a knot at the top of the cardboard to secure the planets. Make sure you connect the planets to the right orbit and the sun in the middle hole. From inside to outside, the order is: sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

9. 9

Make a hanging string for your model. Cut three 6-inch pieces of string and one 12-inch piece of string. Tape them, spread equally apart, along the outer edge of the piece of cardboard with the orbits labelled. Tie the four pieces of string together at the non-taped ends. Tie a loop at the end of the longest piece of string: this is where you will hang the 3-D solar system model.

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