# How long does it take for the Earth to make one revolution ...

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• ### When is the full moon

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How long does it take for the Earth to make one revolution around the sun? |It takes the Earth about 365 days to make one revolution around the sun. | |

|How long does it take the moon to make one revolution around the Earth? |It takes the moon about one month to make one revolution around the Earth. |

|What causes the change of seasons on Earth? |The change of seasons on Earth is caused by the Earth’s tilt on its axis. |

|What causes the phases of the moon? |The phases of the moon are caused by its position relative to the Earth and the|

| |sun. |

|What are the phases of the moon? |The new moon, the waxing crescent, first quarter, waxing gibbous, full moon, |

| |waning gibbous, last quarter, and waning crescent. |

|What is the sun? |The sun is an average sized star. |

|What is the diameter of the sun? |The diameter of the sun is about 110 times bigger than the diameter of the |

| |Earth. |

|How old is the sun? |The sun is about 4.6 billion years old. |

|Describe the moon. |The moon is a small rocky satellite. It is about ¼ the size of the Earth. It |

| |is about 1/8 the mass of the Earth. It has extreme temperatures and virtually |

| |no atmosphere, water, and life. |

|How many planets are in our solar system? |There are nine planets in our solar system. |

|What is the Earth’s position in the solar system? |Earth is the third planet from the sun. It is one of the four rocky inner |

| |planets. |

|How far is the Earth from the sun? |Earth is about 150 million kilometers from the sun. |

|Does the Earth’s surface change? |The Earth’s surface is constantly changing. |

|Describe Earth. |Earth has large amounts of life-supporting water and an oxygen-rich atmosphere.|

|How does Earth’s atmosphere protect the Earth? |The Earth’s atmosphere protects Earth from the sun’s damaging rays by blocking |

| |out most of them. |

|What was Aristotle’s model of the solar system? | |

| |Aristotle thought that the Earth was in the center of the universe. |

|Who figured out that the sun was the center of the universe? |Copernicus and Galileo discovered that the sun was the center of the universe. |

|What space missions added to our understanding of the moon? |The NASA Apollo missions put man on the moon and added to our understanding of |

| |the moon. |

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