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Chapter 18: Inner and Outer Planets 1. What is the study of objects in Name:______________________ 1. Astronomy space? 2. How does gravity affect the 2. It keeps planets moving in circular movement of planets? paths instead of straight lines. 3. The planet Mercury is very hot 3. Mercury has no atmosphere to during the day and very cold at night. hold in heat. Why is this? 4. What do you know about Mars? 4. Mars is an inner planet with two moons. The planet sometimes has huge dust storms that cover the planet. The rocks and solid found on the planet are rich in iron. 5. What is the cause of the Great Red 5. The Red Spot on Jupiter is a storm Spot on Jupiter? that has been raging for hundreds of years. 6. What are the rings of Saturn made 6. The rings of Saturn are made of of? water, ice, dust, and chunks of rocks. 7. Jupiter has the greatest number 7. moons of what? 8. Pluto has a moon named what? 8. Charon 9. What is different about the 9. Uranus rotates on its side. planet Uranus? 10. What about Earth makes life 10. the atmosphere and liquid water possible? 11. What is the universe? 11. The universe is all of space and everything in it. 12. What is a galaxy? 12. A galaxy is a system of dust, gas and millions of stars held together by gravity. 13. What is a solar system? 13. The solar system includes the Sun, the planets, their moons, dwarf planets, asteroids, and other objects. 14. What are craters? 14. Craters are dents shaped like bowls. 15. What is a space probe? 15. A space probe is a vehicle that carries cameras and other tools for different objects in space. 16. What is a satellite? 16. A satellite is an object that orbits another object in space. 17. Why can life not exist on Venus? 17. Venus is surrounded by a thick atmosphere of hot, poisonous clouds that would poison any living thing on the planet. Venus is also too hot for life to exist because it is so close to the Sun. 18. Name the four gas giants that are 18. Jupiter, Saturn, Uranus, Neptune outer planets. Tell me something Jupiter: largest planet in the solar about each planet. system Saturn: has a ring system that orbits the planet Neptune: smallest of the gas giants Uranus: the only planet that rotates on its side