题目内容
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What does the galaxy look like？
A．If you were above it and look down on it, it would look like a flat and round watch.
B．If you looked at it from its edge, it would look like the Milky Way.
C．If you looked at it from its inside, it would look like a large watch.
D．If you looked up, it would look like a night sky.
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更多“What does the galaxy look like…”相关的问题
What does the interviewee say about the games like Fold It or Galaxy Zoo？
A．Children are fascinated about these scientific games.
B．They help people learn about the scientific process.
C．They make science classes in schools really fun.
D．These scientific games require large spaces.
There are three main types of galaxy: spiral, elliptical, and irregular. The Milky Way is a spiral galaxy, a flattish disc of stars with two spiral arms emerging from its central nucleus. About one-quarter of all galaxies have this shape. Spiral galaxies are well supplied with the interstellar gas in which new stars form. as the rotating spiral pattern sweeps around the galaxy it compresses gas and dust, triggering the formation of bright young stars. The elliptical galaxies have a symmetrical elliptical or spheroidal shape with no obvious structure. Most of their member stars are very old and since ellipticals are devoid of interstellar gas, no new stars are forming in them. The biggest and brightest galaxies in the universe are ellipticals with masses of about 1013 times that of the sun, these giants may frequently be sources of strong radio emission, in which case they are called radio galaxies. About two-thirds of all galaxies are elliptical. Irregular galaxies comprise about one-tenth of all galaxies and they come in many subclasses.
Measurement in space is quite different from measurement on Earth. Some terrestrial distances can be expressed as intervals of time, the time to fly from one continent to another or the time it takes to drive to work, for example. By comparison with these familiar yardsticks, the distances to the galaxies are incomprehensibly large, but they too are made more manageable by using a time calibration, in this case the distance that light travels in one year. On such a scale the nearest giant spiral galaxy, the Andromeda galaxy, is two million light years away. The most distant luminous objects seen by telescopes are probably ten thousand million light years away. Their light was already halfway here before the Earth even formed. The light from the nearby Virgo galaxy set out when reptiles still dominated the animal world.
What does the second paragraph mainly discuss？
A．The Milky Way.
B．Major categories of galaxies.
C．How elliptical galaxies are formed.
D．Differences between irregular and spiral galaxies.
A．To describe the effect that distance has no visibility.
B．To compare the ages of two relatively young galaxies.
C．To emphasize the vast distances of the galaxies from Earth.
D．To explain why certain galaxies cannot be seen by a telescope.
What could astronomers better estimate once they knew what nebulae really were？
A．The diameter of variable stars
B．The density of cosmic dust
C．The size of the universe
D．The average number of planets in a galaxy
听力原文： There is probably nothing more mysterious and wonderful-looking in the sky than the Milky Way, stretching like a band of jewels from one end of the sky to the other. Long, long ago, when people gazed at this sight, they were filled with wonder just as you are today. But since they didn't know what it was, they made up all sorts of strange and beautiful conjectures of the Milky Way.
For example, in early Christian times, people thought it was a way along which the servants of God went up to heaven. Some imagined it was an opening in the heaven, so that we here on earth could have a glance of the magnificent inside.
Knowing the facts about the Milky Way, as we do today, doesn't take away any of the wonder of it. The facts are just as amazing as any "made-up" idea!
Our galaxy is roughly like a watch, round and flat. If you could get above it and look down on it, it would look like a very large watch. But we are inside the galaxy, and when we look up we are looking towards the edge from inside the "watch". So we' see that edge around us. And since there are millions of stars in it, they appear to us as the Milky Way.
Do you know that there are at least 3,000,000,000 stars in the galaxy？ And here is an idea of its size. It takes eight minutes for light from the sun to reach the earth. For light from the middle point of the galaxy to reach the sun, it takes about 27,000 years! The galaxy turns about its center like a wheel. From our position in it, it takes about 200,000,000 years just to make one round.
Long, long ago, people didn't know what the Milky Way was, so they explained it ______.
A．as we do today
B．as they imagined
C．as they studied
D．as the Bible says
What does the woman do？
A．Housewife
B．Counselor
C．Student
D．Teacher
What does the man want？
A．an account
B．money
C．check
