1、Perhaps people will fly to Mars.,Topic3 SectionD,2. But during spring and summer, strong storms can cover the whole surface of Mars.,3. It goes around the sun at a distance of about 228 million kilometers.,4. Its a quarter as big as the earth.,5. The gravity on the surface of Mars is about one third
2、 as strong as it is on the earth.,6. The temperature on Mars is between -140oC 20oC.,7. The air has only 0.13% oxygen.,1.Mars looks like a red and orange ball. Its very beautiful.,Review,The earth is a planet.,The sun is a star.,The earth is a planet and goes around the sun.,There are eight planets
3、that also go around the sun.,The sun and its planets are called solar system.,The solar system is a small part of the universe.,Do you know eight other planets?,Mercury (水星),Venus （金星）,Jupiter （木星）,earth,Mars,Saturn （土星）,Neptune （海王星）,Uranus （天王星）,The distance from the sun,Groupwork,Suppose you live on Mars. Talk about your life on Mars.,Homework,Suppose you live on another star or planet. Write a passage about your life on it. The words on the left may help you.Mars. Talk about your life on,Clothing Food and drink Weather Transportation .,Goodbye!,
