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A passing comet smashed into the rock and dropped off a load of liquid.
A．Right
B．Wrong
C．Not mentioned
答案
更多“A passing comet smashed into the rock and dropped off a load of liquid.A．RightB．WrongC．Not”相关的问题
第1题
But by far tile most startling and tentative finding is that the universe has a preferred orientation. Such directionality would challenge one of the basic tenets of physics and astronomy, taken for granted by Einstein, Newton and even Kepler. These giants all assumed that space possesses a property called rotational symmetry: spin a chunk of cosmos sideways or flip it upside down, and measurements of events within it yield precisely tile same results.
In the April 21, 1997 issue of physical Review Letters, however, Borge Nodland of the University of Rochestre and John P. Ealston of the University of Kausas present evidence that the principle of rotational symmetry may be violated on a cosmic scale. Measurements of light from distant galaxies, they say, vary depending on the galaxies' position in the sky.
Other theorists doubt whether the claim will stand up to close scrutiny; at least two critical analyses have already been posted on the Internet. For the moment, however, even the critics can savor the frisson of a tremor rocking their field' s foundations. "Nobody would be happier than me if they were right," says Sean M. Curroll of the University of California at Santa Barbara.
The surprising work on cosmic asymmetry began three years ago, while Nodland was working for his doctorate under Ralston's supervision. Ina search for signs of unconventional large - scale non - uniformity, the two researchers decided to investigate whether polarized light front remote galaxies changes with their direction or distance. (Polarized light typically swings within one plane rather than in all directions, ordinary sunlight does; it can be produced by a variety of phenomena. ) Polarized light often twists as it penetrates through space as a result of its encounters with electromagnetic fields; this well- understood phenomenon is called the Faraday effect. But Nodland and Raison wondered whether additional twisting effects might be at work.
To find out, they focused on studies of galaxies that emit large amounts of synchrotron radiation, a highly polarized form. of electromagnetism generated by charged particles passing through a strong electromagnetic field. After combing through the published literature, Nodland and Ralston compiled polarization data for 160 galaxies.
Their investigation involved a crucial assumption, that the initial angle of polarization of the light relative to the plane of each galaxy was the same for all 160 galaxies. Given this assumption and the estimated distances to the galaxies (inferred from their red shifts), Nodland and Ralslon could calculate whether the light underwent any twisting other than that caused by the Faraday effect.
The departure of the splendid Hale-Bopp comet is mentioned______.
A．to honor the contributions of Hale-Bopp.
B．to introduce to the topic of new report on cosmic matters.
C．to challenge the basic tenets of astronomy.
D．to recount the reactions of the public to the comet.
第2题
The two more exciting and rare sky events will occur in March, 1997 are______.
A．a comet and a lunar eclipse (月蚀)
B．comet Hale-Bopp and comet Hyakutake
C．a comet found by two Americans and a solar eclipse
D．a solar eclipse and comet Hyakutake
第3题
Which of the following statements is NOT true？
A．March 25 was supposed to be the best time to observe comet Hyakutake.
B．Comet Hale-Bopp and comet Hyakutake will pass over the northern part of Heilongjiang province in 1997.
C．A nationwide astro-photo competition will be organized in March, 1997.
D．The comet will not return for 3 000 years.
第4题
根据下列文章，回答 51～55 题。
第 51 题 Why was Kohoutek referred to as“the comet of the century”？
第6题
Beijing sky watchers will be excited because ______.
A．they expect to see with their naked eyes the comet found by Hyakutake
B．they will see a comet through a telescope for the first time
C．they have observed a comet by themselves
D．they expect to see the comet found by a Japanese amateur astronomer through a telescope
第7题
When you look up at the night sky, what do you see？ There are other(26)_____bodies out there besides the moon and stars. One of the most(27)_____of these is a comet.
Comets were formed around the same time the Earth was formed. They are(28)_____ice and other frozen liquids and gases.(29)_____these "dirty snowballs" begin to orbit the sun, just as the planets do.
As a comet gets closer to the sun, some gases in it begin to unfreeze. They(30)_____dust particles from the comet to form. a huge cloud. As the comet gets even nearer to the sun, a solar wind blows the cloud behind the comet, thus forming its tail. The tail and the(31)_____fuzzy atmosphere around a comet are(32)_____that can help identify this(33)_____in the night sky.
In any given year, about a dozen known comets come close to the sun in their orbits. The average person can’t see them all, of course. Usually there is only one or two a year bright enough to be seen with the(34)_____eye. Comet Hale-Bopp, discovered in 1995, was an unusually bright comet. Its orbit brought it(35)_____close to the Earth, within 122 million miles of it. But Hale-Bopp came a long way on its earthly visit. It won’t be back for another four thousand years or so.
第9题
Maria Mitchell(1818-1889,the first woman astronomer(天文学家)in the United States, was born in Nantucket. Massachusetts. Her parents valued education and insisted on giving her the same quality of education that boys received.
Her father. William Mitchell, was an astronomer and teacher himself. When he built his own school, Maria became a student and also a teaching assistant to him. At home. Marias father taught her to watch the stars and other natural objects in space using his personal telescope(望远镜).
Later she went to work at the library of the Nantucket Atheneum. Over the next tweny years. she further developed her interest in reading as many books as she could.She spent her nights watching the sky closely with her father.
On October 1, 1847,Maria discovered a comet(彗星 )by merely using a two-inch telescope. Some years before, King Frederick VI of Denmark had set up prizes to each discover of a"telescopic comet". The prize was to be given to the"first discoverer"of each such comet because comets were often discovered by more than one person.
There was once a question of who should be the winner. As the story goes, francesco de Vico had discovered the same comet two days later, but had reported it to the European vor. She won the prize in 1848 and became a big name the world over. The comet was named“ Miss mitchell&39;s Comet.”
What ean be learnt about Marias parents according to the text？
A.They came from low-income families.
B.They gave Maria equal chance for education
C.They were both astronomers
D.They were both teachers.
When did Franeeseo de Vico discover the comet？A.In1818
B.In1889
C.In1848
D.In1847
What problem did Maria meet with in winning the prize？A.She named the comet on her own
B.She did not use the required telescope.
C.She did not report her discovery in time
D.She discovered the comet with her father
Whe played the most important role in Maria's great achievement？A.King FrederickⅥ
B.Francesco de Vico
C.Her father
D.Her mother
请帮忙给出每个问题的正确答案和分析，谢谢！
第10题
For thousands of years comets had been a mystery to S1.______
man. They travel across the sky very fast and have a
bright "tail" of burnt gas. The comet Tempel 1 has an S2.______
orbit far outside the orbit of the furthest planet in our
solar system, Pluto. It has had been there for 4.6 billion years, S3.______
133 million kilometres from Earth. Last week
a little American spacecraft crash into Tempel 1. S4.______
The spacecraft had a camera and it took a photograph
of the comet every minute after it finally crashed into S5.______
its surface. The space mission to Tempel 1 cost $335
million and was called Deep Impact. Spacecraft was S6.______
travelling at 37,000 kilometres per hour when it hit the comet
and the crash completely destroying the spacecraft. But before S7.______
it hit the comet, the spacecraft took some amazingly photographs. S8.______
The last one was a close-up picture the spacecraft spent S9.______
just 3 seconds time before it crashed into the comet. S10.______
【S1】
