Sun-Earth-Moon “Need to Know” Know the difference between solar system, galaxy, and universe What is the name of the galaxy in which we live? In what ways does the Moon move in relation to the Earth? In what ways does the Earth move in relation to the Sun? How many Earth’s could fit inside the Sun? How many Earth diameters fit across the diameter of the Sun? What is a satellite? What is Earth’s natural satellite? How long does it take the Moon to complete one rotation and one revolution? How long does it take the Earth to complete one rotation and one revolution? What causes day and night on Earth? Why is the force of gravity stronger on Earth than it is on the Moon? How far is the Moon from the Earth measured in Earth diameters? How much bigger is the Earth than the Moon in diameter? What is a leap year and why do we have them? Why do the Sun and Moon appear to be the same size in the sky? Sun-Earth-Moon “Need to Know” Know the difference between solar system, galaxy, and universe What is the name of the galaxy in which we live? In what ways does the Moon move in relation to the Earth? In what ways does the Earth move in relation to the Sun? How many Earth’s could fit inside the Sun? How many Earth diameters fit across the diameter of the Sun? What is a satellite? What is Earth’s natural satellite? How long does it take the Moon to complete one rotation and one revolution? How long does it take the Earth to complete one rotation and one revolution? What causes day and night on Earth? Why is the force of gravity stronger on Earth than it is on the Moon? How far is the Moon from the Earth measured in Earth diameters? How much bigger is the Earth than the Moon in diameter? What is a leap year and why do we have them? Why do the Sun and Moon appear to be the same size in the sky?