河北省石家庄市第一中学高一英语必修三教学课件：unit4warmingupreading

stars

The universe is made up of stars, planets, and other matter scattered throughout space.

years across. It is about 14 billion years old and takes 225 million years or so to rotate

（旋转）once. Like all spirals, it con tains plenty of gas and dust, from which new stars are formed. The dense nilcleus （核心）is the oldest part and has no gas left for new star.

1 .Mercury（水星）4.Mars （火星）7.Uranus （天王星）2.Venus（金星）5.Jupiter （木星）8.Neptune （海王星）3.Earth（地球）6,Saturn （丄星）9.Pluto （冥王星）

Our solar system is made up of the sun and the objects that orbit it. These in elude the nine planets （and probably more than nine） and their moons, as well as asteroids （小行星）,comets, a nd meteors （流星）?

The sun is the n earest star to the earth .It is a globe of hot gas, mostly hydrogen （. 氢），and lies at the center of our solar system .It contains no solid material.

Stars are large balls of hot gas that produce light and heat through nuclear reactions. Our Sun is an average yellow star, but seems bright because it is so close.

Mercury The Roman god of merchants and travellers

Venus The Roman goddess of love

Mars The Roman god of war

Jupiter The king of the Roman gods

Saturn The Roman god of seeds and sowing

Uranus The Greek god of the sky

Neptune The Roman god of the sea

Pluto The Roman god of the dead

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