Our solar system.doc

Our solar system We are in the solar system.There are nine planets in it.They are the Mecury（水星）,the Venus（金星）,the Earth,the Mars（火星）,the Jupiter（木星）,the Saturn(土星),the Uanus（天王星）,the Nepturn（海王星） and the Pluto（冥王星）.They cant give us light and heat.But the sun can give us light and heat. This is the solar system.Nine planets go round the sun.They never stop.The sun is the host of the solar system.It is a star.It is very big,bright and hot because the sun is made of hot gas.It is very big,so it is very heavy.It is 20000000000000000000 kilogram. Then,we talk about nine planets.Mecury(水星) is the nearest（接近） planet（行星） to the sun,so it is very hot（热）.It is white.It has no satellite （卫星）go round it.Venus（金星） is the second nearest planet to the sun.It has no satellite,too.But it is hoter than the Mecury.It is golden.It is the brightest planet of the solar system.Mecury and Venus have no satellite.The other planet both have at least（最少） one satellate.We are on the Earth.It has a satellite-moon.It is the only one has airin the solar system.It isntvery hot or cold,so we can live on the Earth.Mars has two satellites.It looks like a red star in the sky.It has seasons.Some people say,there are people on it,and it is not true. And the next four planets are gas planets.They have ring round themselves. Jupiter is the biggest planet in the solar system.It is very big.It has 16 satellites round it. Saturn is a big planet,too.But it is smaller than the Jupiter.It has 22 satellitesMore than theJupiter. We need a telescope to see Uanus,Neptune .Because they are very far to the Earth.Uanus is green.It has15 satellites round it.It takes 84 years goround the sun. Neptune is blue.It Has 8 satellites round it.It takes 164 years go round the sun.It is more far to the sun.Pluto is the farest one to the sun.We cannot se