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Earth, Moon and Mars Balloons

Use the information from this table to determine the scale of your Earth balloon and to calculate the size of your other models. Be sure to fill in any missing information from the tables. Measurements are presented in kilometers (km) and centimeters (cm).

Body | Diameter (km) | Model Diameter (cm) |

Earth |
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Moon |
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Mars |
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Phobos |

To find out what scale your Earth balloon is, divide the diameter of the Earth in km (12,756) by the diameter of the model in cm (20).

To find the diameters of the other two models, divide the actual diameter by the scale of the models (your answer from the last question).

Use this table to calculate the distances between the planets.

Bodies | Average Distance (km) | Model Distance (cm) |

Earth to Moon |
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Earth to Mars |

To find the distance between each of your models, divide the actual distance by the scale of the models.