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Science Test Study Guide (Chapter 8) 1. 2. How Earth Moves Earth rotates, or spins, on a slightly tilted axis. Earth completes one full rotation every 24 hours. Our seasons change because Earth tilts on its axis. When one half of the Earth has a certain season the other half has the opposite season (fall – spring, winter – summer) Earth revolves around the Sun. The Sun and Its Planets The solar system is made up of the Sun and all the objects that orbit it. Our Sun is a star. The Moon is a satellite of the Earth. There are eight planets that circle the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. All the planets orbit the Sun. The inner planets are the four planets closest to the Sun: Mercury, Venus, Earth, and Mars. They are all small and made up of solid, rocklike materials. The outer planets are Jupiter, Saturn, Uranus, and Neptune. They are made up mostly of gases. Jupiter is the largest planet in our solar system. Neptune and Jupiter have great big spots on them. Mars is known as the “red planet”. Uranus rotates on its side. Earth is the only planet with liquid water. Mercury is the closest planet to the Sun. Saturn is known for its thousands of beautiful rings.