Light from the sun reaches us in 8.5 minutes.The sun is about 149,640,000km from the earth.
The other stars are farther away than the sun.Light from the nearest star reaches us in about four years.When you look at a star,you do not see its present condition.You see it as it used to be.Light from some stars takes hundreds of years to reach us.We never see a star as it is now.We see it as it was long ago.The sun and the earth arein agreat group of stars.There are about100,000,000,000 stars in it.We call this group the galaxy.Outside the galaxy there is empty space;but thousands of millions of kilometers away there is another galaxy.Light from this other galaxy reaches us after about 2 million years.There are millions of these galaxies;and they appear to be rushing away from us.The light takes millions of years to arrive here;so we see a distant galaxy as it used to be.The light left it millions of years ago.It travelled across space and then went into an astronomer's eye.
1,When we look at the sun,we see it as it was hundreds of years ago. A,Right B,Wrong C,Doesn't say
2,The earth and the sun are in the same galaxy.
A,Right B,Wrong C,Doesn't say
3,There are two galaxy in the universe.
A,Right B,Wrong C,Doesn't say
4,The galaxies are thousands of millions of kilometers away from each other. A,Right B,Wrong C,Doesn't say
5,The astronomers may go to another galaxy in the future.
A,Right B,Wrong C,Doesn't say
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