Module3：Journeytospace.pptx

Scientists?think?that?there?has?been? life?on?the?earth?for?hundreds?of? millions?of years.Translate:科学家们认为_________________________________。; The earth is a _______ and it goes around the sun. The sun is a ______. And there are _______ other planets. But the environments of the planets are quite ___________ from that of the earth. The sun and its planets are called ________________and it is only a small part of _____________or called ______________. ; Please give a right order: small——large solar system, earth , galaxy, sun, universe _______—_________—___________________— _______—______________ ;;Please check them True or False. 1. The light from the stars in other galaxies has travelled for a long time to reach us. ( ) 2. Scientists have even sent spaceships to travel outside the Milky Way. ( ) 3. Our spaceship has only reached one star in our Galaxy. ( ) ;1. Can you answer the three questions in Paragraph 5? 2. Do you have other questions about the universe? ;Read aloud;Writing; 八大行星是太阳系的八个行星，按照离太阳的距离从近到远，它们依次为水星、金星、地球、火星、木星、土星、天王星、海王星。 太阳系行星的定义：一是必须围绕太阳运转的天体；二是质量足够大，能依靠自身引力使天体呈圆球状；三是其轨道附近应该没有其他物体。而冥王星由于“先天”不足，只有出列了，被划入了“矮行星”。 因其一：体积过小，它的质量只有月亮的1/3；二：轨道过于椭圆；三：八星轨道几乎在同一平面，而冥王星与八星轨道平面倾斜角达17度。