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 lifesupporting water and an oxygenrich 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.