How Do Earth and the Moon Compare? Earth and Beyond How Do Earth and the Moon Compare?

The Moon and Earth Moon – any natural body that revolves around a planet. Crater – a low, bowl shaped area on the surface of a planet or moon.

Terms You Need to Know Axis – the imaginary line or pole that the earth rotates on, giving us daylight and night time. Orbit - An orbit is the path one object in space takes around another Day - the amount of time it takes for Earth to rotate on its axis one time Month – the amount of time that it takes for the moon to orbit the Earth one time Year – the amount of time that it takes the Earth to orbit the sun one time.

Ways the Moon and Earth are Alike Both are rocky Both are fairly dense Both are made of the same elements Both have craters

Earth Moon Larger Size Smaller Size Stronger Gravity Weaker Gravity Looks blue from space Looks gray from space Has liquid water Does not have liquid water Has an atmosphere Does not have an atmosphere Supports life Doesn’t Support

The Earth, Moon, and You The moon's gravity is about 1/6 that of Earth. Weight is determined by the amount of gravity. If you weigh 10 lbs. on the moon, then you would weigh 60 lbs. on Earth. If you weigh 120 lbs. on Earth, then you would only weigh 20 lbs. on the moon.

Mass Stays the Same Your mass will always stay the same, but your weight can change depending on the amount of gravity.

High Mass vs. Low Mass Planets You will weigh more on a high mass planet because there is more gravity. You will weigh less on a low mass planet because there is less gravity.

Daily Science Inquiry The time that it takes the moon to orbit around the Earth is called a ______. What is an axis? What is a crater? How much would you weigh on the moon if you weigh 180 on the Earth? How much would an object weigh on Earth if it weighs 60 pounds on the moon? Why do you weigh more on Earth than the moon? Name 3 ways that Earth and the moon are alike. Name 3 ways that Earth and the moon are different. List the planets in order starting with the one nearest to the sun.