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When a large star explodes， the gravity compacts ever piece into __________

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A.the creation of new entities

B.an explosion of huge stars

C.the tiniest particle

D.the same amount of mass

E.the existence of black holes

F.a fraction of an inch

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更多“When a large star explodes， th…”相关的问题

第1题

28 When a large star explodes, the gravity compacts every piece into ______.

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第2题

When a large star explodes， the gravity compacts every piece into __________.

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A.the creation of new entities

B.an explosion of huge stars

C.the tiniest particle

D.the same amount of mass

E.the existence of black holes

F.a fraction of an inch

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第3题

When man began to search the skies, he saw a lot of things. In the universe（宇宙),the eart

When man began to search the skies, he saw a lot of things. In the universe(宇宙),the earth seemed to be just a small bit of dust. It is only a small planet, and travels around the sum The sun together with its planets, travels in the Milky Way(银河), our galaxy(星系). The Milky Way has about thirty billion stars like our sun, and is one of about a hundred million galaxies in the universe

Because the space (空间)is so great, it is difficult to work out how far away a star is. Instead of kilometres, we have light-years. A light-year means how far light travels in one year. Our nearest neighbour galaxy is more than 9000,000 light-years away from the earth.

Man has known that ______.

A．the Milky Way is the only galaxy

B．other galaxies are near ours

C．the sun is a large star in the Milky Way

D．the earth is a small part of the universe

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第4题

When man began to search the skies, he saw a lot of things. In the universe（宇宙), the ear

When man began to search the skies, he saw a lot of things. In the universe(宇宙), the earth seemed to be just a small bit of dust. It is only a small planet, and travels around the sun. The sun together with its planets, travels in the Milky Way(银河), our galaxy(星系). The Milky Way has about thirty billion stars like our sun, and is one of about a hundred million galaxies in the universe.

Man has known that ______ .

A．the Milky Way is the only galaxy

B．other galaxies are near ours

C．the sun is a large star in the Milky Way

D．the earth is a small part of the universe

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第5题

听力原文： The jazz and blue singer Nina Simone has died at her home in southern France. Bo

rn in North Carolina, she was originally trained as a classical pianist and became a star with her performance of I Love You Porgy from the. opera Porgy and Vest. She was best known for her interpretation of My Baby Just Cares for Me and a version of the number I Put A Spell On You. Her programs also included a large number of civil rights songs.

When Nina Simon was young, she received training in ______.

A．piano playing

B．classical music

C．jazz and blue

D．classical dance

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第6题

听力原文：The jazz and blue singer Nina Simone has died at her home in southern France. Bor

听力原文： The jazz and blue singer Nina Simone has died at her home in southern France. Born in North Carolina, she was originally trained as a classical pianist and became a star with her performance of l Love You Porgy from the opera Porgy and Vest. She was best known for her interpretation of My Baby Just Cares for Me and a version of the number 1 Put A Spell' On You. Her programs also included a large number of civil rights songs.

When Nina Simon was young, she received training in ______.

A．piano playing

B．classical music

C．jazz and blue

D．classical dance

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第7题

A Star Is Born 1．The VLT （Very Large Telescope) is the wodd's largest telescope （望远

A Star Is Born

1．The VLT (Very Large Telescope) is the wodd's largest telescope (望远镜) and is taking astronomers (天文学家) further back to the Big Bang than they ever thought possible. Located 2,600 metres up in the Chilean Andes, it has four huge mirrors, each about the size of a London bus. The VLT is so powerful it can spot a burning match 10,000 kilometres away.

2．This astonishing power will allow astronomers to see events in space from the birth of stars to the collision (碰撞) of galaxies (星系) on the edge of the cosmos (宇宙).The VLT is giving astronomers their best-ever view of the cosmos. The power of the VLT to see the smallest detail at the furthest distances makes its designers amazed.

3．Take the case of Eta Carinae, one of the most explosive stars in the universe. This star produces ultraviolet laser rays (紫外线) and it will destroy itself in a few million years' time. It is five times brighter than the sun and when it explodes it is going to be a sight worth waiting for!

4．But it is at distances of millions, even billions, of light years that the VLT really shows its power. The VLT can detect light that set out on its journey before the earth even existed. This gives astronomers their first-ever detailed views of events that took place in the earliest days of the cosmos.

5．In other words the VLT is a kind of a time machine. It takes astronomers back to a time when complete galaxies crashed into each other. The effects of these past collisions can now be seen by scientists, and astronomers believe the telescope will reveal more about these exciting events in the years to come. One day, we might be able to say we have traveled back to the beginning of time, and we will have a much clearer picture of how our planet was born.

第 23 题 Paragraph 1____________

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第8题

改错：What is a black hole？ Well, it is difficult to answer the question

What is a black hole？ Well, it is difficult to answer the question,

as the terms we would normally use to describe a scientific phenomenon __1__are adequate here. Astronomers and scientists think that a black hole is __2__a region of space which matter has fallen and from which nothing can __3__

escape—not even light. But we can’t see a black hole. A black hole __4__exerts a strong gravitational pull and yet it has no matter. It is only space—or thus we think. How can this happen？ __5__

The theory is that some stars explode when their density increases to a particular point; they “collapse” and sometimes a supernova occurs.

The collapse of a star may produce a “White Dwarf” of a “neutronstar”—

a star which matter is so dense that if continually shrinks by the force of __6___its own gravity. But if the star is very large, this process of shrinking may be so intense that a black hole results in. Imagine the earth reduced to the __7__size of a marble, but still having the same masses and a stronger __8__gravitational pull, and you have some ideas of the force of a black hole. __9__And no matter near the black hole is sucked in. __10__

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第9题

A telescope, like a microscope, enables us to see things which we could not see without it

. A microscope magnifies things(or features of things)which are so small that they are invisible to the naked eye. They may be as small as a cell or even a small group of molecules. "Micro" in Greek, and in several English technical words, means "small". But "tele" in Greek means distant or far away. The word "television" is also derived from this Greek word. In England, Australia, and New Zealand we call a television set the "telly", which is almost the same as the Greek word. In the United States people call it a TV. A telescope enables us to see objects which, though millions of times larger than ourselves, appear much smaller because they are so far away. Even the images of stars which we see through a telescope are, of course, greatly reduced in size in comparison with the stars, actual size. But a telescope enables us to see stars which are invisible to the human eye as well as giving us a brighter, clearer image of those which are visible. In the last twenty or thirty years there has been a great improvement in the design and magnifying power of telescopes. There are now some very large and powerful telescopes in existence. When you see the sun rise in the morning you are eight minutes late. What is the meaning of this strange statement？ The fact is that it takes eight minutes for the light to travel from the sun to the earth. The speed of light is approximately 186,000 rails per second. When you see a planet with or without the help of a telescope you are again too late to see the planet as it exists when you look at it. You see it as it was some time earlier. What happens when you observe stars beyond the solar system？ Light from these stars takes a much longer time on its journey. In many cases it takes millions of years to reach our planet. Perhaps you believe that when you see a particular star, you and the star exist simultaneously. But this cannot be true. Be tween you and the star there are many millions of miles in space; and this means that there is also a long history of several million years between the star and you; in other words, the star which you are looking at now no longer exists in the form. in which you see it. Perhaps at this moment there is no star at that particular point in space. Stars, like human beings, are born and die.

A microscope______.

A．may be as small as a cell or a small group of molecules

B．is similar to a telescope

C．enables us to see things that are invisible

D．enables us to see things that are too small to be seen

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第10题

根据以下材料，回答题Black Holes（1） Black holes can be best described as a sort of vacuum， s

根据以下材料，回答题

Black Holes

（1） Black holes can be best described as a sort of vacuum， sucking up everything in space.

Scientists have discovered that black holes come from an explosion of huge stars. Stars that are near death can no longer bum due to loss of fuel， and because its temperature can no longer control the gravitational （重力的） force， hydrogen ends up putting pressure onto the star"s surface until it suddenly explodes then collapses.

（2） Black holes come from stars that are made of hydrogen， other gases and a few metals.

When these explode it can turn into a stellar-mass （恒星质量） black hole， which can only occur if the star is large enough （should be bigger than the sun） for the explosion to break it into pieces， and the gravity starts to compact every pieceinto the tiniest particle. Try to see and compare: if a star that"s ten times the size of the sun end up being a black hole that"s no longer than 70 kilometers， then the Earth would become black hole that"s only a fraction of an inch!

（3） Objects that get sucked in a black hole will always remain there， never to break free. But remember that black holes can only gobble up （吞噬） objects within a specific distance to it.

It"s possible for a large star near the sun to become a black hole， but the sun will continue to stay in place. Orbits （轨道） do not change because the newly formed black hole contains exactly the same amount of mass as when it was a star， only this its mass is totally contracted that it can end up as no bigger than a state.

（4） So far， astronomers have figured out that black holes exist because of Albert Einstein"s theory of relativity. In the end， through numerous studies， they have discovered that black holes truly exist. Since black holes trap light and do not give off light， it is not possible to detect black holes via a telescope. But astronomers continue to explore galaxies （星系），space and the solar system to understand how black holes. It is possible that black holes can exist for millions of years， and later contribute further process in galaxies， which can eventually lead to creation of new entities. Scientists also credit black holes as helpful in learning how galaxies began to form.

Paragraph 1 __________ 查看材料

A.Is there proof that black holes really exist？

B.What are different types of black holes？

C.How are black holes formed？

D.How were black holes named？

E.What happens to the objects around a black hole？

F.What are black holes made of ？

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