2. 职称考试
  3. Black Holes 1 Black holes can be best described as a sort of vacuum, suckin...

Black Holes 1 Black holes can be best described as a sort of vacuum, suckin...

admin2020-12-24  49
问题 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 explosion of huge stars. Stars that are near death can no longer burn 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 explode 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 piece into the tiniest particle. Try to see and compare: if a star that’s ten times the size of the sun ends up being a black hole that’s no longer than 70 kilometers, then the Earth would become a 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 time 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 nearly impossible to detect black holes via a telescope. But astronomers continue to study galaxies (银河系), space and the solar system to understand how black holes might evolve. It is possible that black holes can exist for millions of years, and later contribute to a bigger process in galaxies, which can eventually lead to creation of new entities (实体). Scientists also credit black holes as helpful in learning how galaxies began to form.

A newly formed black hole and the star it comes from are of _____________
选项 A the tiniest particle
B a fraction of an inch
C the same amount of mass
D an explosion of huge stars
E the creation of new entities
F the existence of black holes
答案C
解析第三段第四句 "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”，意思是“新形成的黑洞的轨道不会变，因为它的质量和它之前是恒星时的质量一样”。所以答案是C，“相同的质量”。
转载请注明原文地址:https://ti.zuoweng.com/ti/wr9QKKKQ
相关试题推荐
随机试题