[填空题]The astronomers actually control the telescope in the operating room instead of being near the telescopes.

[填空题]The astronomers actually control the telescope in the operating room instead of being near the telescopes.

[单项选择]Astronomers use photography and sighting telescopes to study the motions of all of the bright stars and many of the faint one.

[单项选择]Virtually everything astronomers known about objects outside the solar system is based on the detection of photons-quanta of electromagnetic radiation. Yet there is another form of radiation that permeates the universe: neutrinos (中微子). With (as its name implies) no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Furthermore, neutrinos carry with them information about the site and circumstances of their production: therefore, the detection of cosmic neutrinos could provide new information about a wide variety of cosmic phenomena and about the history of the universe.
But how can scientists detect a particle that interacts so infrequently with other matter Twenty-five years
A. At the Threshold of Neutrino Astronomy.
B. Neutrinos and the History of the Universe.
C. The Creation and the Study of Neutrinos.
D. The DUMAND System and How It Works.

[单项选择]Virtually everything astronomers know about objects outside the solar system is based on the detection of photons-quanta of electromagnetic radiation. Yet there is another form of radiation that permeates the universe: neutrinos. With (as its name implies) no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Not a single, validated observation of an extraterrestrial neutrino has so far been produced despite the construction of a string of elaborate observatories, mounted on the earth from Southern India to Utah to South Africa. However, the detection of extraterrestrial neutrinos are of great significance in the study of astronomy. Neutrinos carry with Their information about the
A. get through,
B. pass by.
C. interact with.
D. derive from.

[简答题]Astronomers believe that the expanding universe is the result of an enormous and powerful explosion called the Big Bang. The Big Bang theory may explain how the universe formed. The Big Bang theory states that the universe began to expand with the explosion of concentrated matter and energy and has been expanding ever since. According to the theory, all the matter and energy in the universe was once concentrated into a single place. This place, of course, was extremely hot and dense. Then some 15 to 20 billion years ago, an explosion -- the Big Bang -- shot the concentrated matter and energy in all directions. The fastest moving matter traveled farthest away. Energy, too, began moving away from the area of the Big Bang.

[单项选择]

Astronomers have detected the most distant explosion ever witnessed in the heavens. It was a flash so powerful that they could observe the faint light as it came in from almost the edge of the known universe. The U. S. space agency’s Swift satellite was routinely scouring the cosmos for exploding stars on September 4 when it spotted what scientists have since realized is the most distant such burst on record.
In astronomy, distance means time. The further something is away, the longer its light has been traveling to get to us. So the star blast is also the most ancient ever observed.
The exploding star the Swift satellite observed was typical of the death of a massive star. These blasts am the most powerful in the universe, sending out 100 million times the energy the Sun does in one year. They are not rare, but occur daily, emitting their light in high energy gamma rays. If you could see gamma rays, the sky would twinkle with such bursts.

According to
A. The explosion detected is the most distant one ever witnessed.
B. The explosion detected is the most ancient one ever witnessed.
C. The explosion detected is typical of the birth of a massive star.
D. The explosion is the most powerful in the universe.

[单项选择]The leading astronomers of the sixteenth and seventeenth centuries were fascinated by comets.
A. intrigued
B. infected
C. inconvenienced D. inclined

[单项选择]Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and ______ which nothing can escape.
A. into; from
B. towards; towards
C. out of; from
D. through; through