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　　One possible version：

　　As is mentioned in the passage above，scientists are worrying that one day an asteroid may hit the earth and cause great disasters to human beings.

　　In my opinion，there is no need to worry about it.On the one hand，hundreds of asteroids have hit the atmosphere since 65 million years ago，but none of them have caused great damage to the earth.So we can believe we are safe now，and we will be safe for the next hundreds or thousands of years.On the other hand，with the development of modern science and technology，we can build

　　more powerful telescopes in the years to come，which may help us to discover such asteroids before they hit the earth.Perhaps we can attack them by using huge rockets and change their direction so that they won’t hit us.In a word，believe in ourselves!

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