**How to make earth model based on 3 dimension is simple. We will create a model of the earth using simple materials that around us.**

**aksiografi.com** – Our solar system consists of the Sun, nine planets (celestial bodies orbiting the Sun) along with their moons, asteroids, comets and space dust. The boundary of the solar system is called the heliopause, which is the limit at which the solar wind can reach.

Solar winds are streams that leave the Sun’s atmosphere and flow into the solar system. From the heliopause, our solar system is roughly 18.6 trillion miles (29.8 trillion km) away. The sun is the largest celestial body in our solar system. The Sun’s diameter is roughly 870,000 miles (1,392,000 km). Pluto, which is the smallest planet, is approximately 1,434 miles (2,294 km) in diameter.

Most asteroids and comets are much smaller than Pluto. In this experiment, we will create a 3D model to describe the size of the celestial bodies in our solar system. We will also learn how to describe the distances between planets and between planets and their moons.

**Learning Objectives**

Learning objective of this session is to build a 3-D scale model of the Earth.

**Materials**

drawing compass

metric ruler

8-by-8-inch (20-by-20-cm) square piece of poster board, any color

scissors

index card

pen

**Procedure**

1. The diameter of Earth is 7,973 miles (12,757 km). Using a metric scale of 1 cm = 1,500 km, the diameter of the model Earth can be calculated as follows:

Earth’s diameter ÷ 1,500 km/cm = model’s diameter

12,757 km ÷ 1,500 km/cm = 8.504 cm

Rounding the number to the closest 0.1 cm, the model’s diameter would be 8.5 cm.

2. Use the compass to draw two circles, each with a diameter of 8.5 cm, on the poster board.

3. Cut out the circles. Then cut along a straight line from the edge to the center of each circle.

4. Fit the two circles together at a 90° angle to each other.

5. Prepare a legend showing the scale of the model by folding the index card in half. Write “Earth” and the scale, “1 cm = 1,500 km,” on one side of the card. Stand the card alongside the model.

**Results**

You have made a scale model of the Earth. Why? A scale model is a replica made in proportion to the object it represents. Models of objects in the solar system, such as Earth, are valuable because they allow the observer to study these objects separately as well as in comparison to each other. Because celestial bodies are generally very large, models give a view of the entire system so that their shapes, sizes, and distances can be compared.

You can read the other postings of #nature-school.