首页
登录
职称英语
Lunar sight-seeing trips and orbiting space hotels are within reach, moon wal
Lunar sight-seeing trips and orbiting space hotels are within reach, moon wal
游客
2025-01-10
35
管理
问题
Lunar sight-seeing trips and orbiting space hotels are within reach, moon walking astronaut Edwin"Buzz" Aldrin said last week, but some who favor space tourism worried about its "giggle factor". Astronomers have known for years that a source of intense energy emissions lies at the center of the Milky Way Galaxy, obscured from view by vast clouds of dust and gas. In February, 1992, researchers at the Max Planck Institute in Garching, Germany, reported evidence that the mysterious energy source is a gigantic black hole.
Observations have shown that many strong energy sources lie at the heart of the Milky Way. One of them, called Sagittarius A, is thought to be the actual center of the Galaxy, the point about which the great spiral of stars rotates. Sagittarius A is a powerful emitter of radio waves and X-rays.
Astronomers have considered two possible explanations for the identity of Sagittarius A. They theorized that it is either a compact duster of normal stars or a super-massive black hole containing as much as a million or more suns. The German scientists reported that they found strong evidence in support of the black hole explanation.
The astronomers used a new telescope high in the Andes Mountains of Chile to obtain the sharpest images ever made of the region around Sagittarius A. The image shows that Sagittarius A is a single, small object rather than a duster of stars.
The researchers also found that a bubble of gas is expanding outward from Sagittarius A. This expanding gas is similar in temperate, density, and composition to the jets of gas that astronomers have observed flow hag away from the centers of many other galaxies. Such jets are thought to be generated by accretion disks surrounding enormous black holes. Accretion disks are vast, swirling masses of gas and dust that give off titanic amounts of energy as they are sucked into the black hole. The similarity between the jets emitted by some galaxies and the gas bubble surrounding Sagittarius A supports the idea that Sagittarius A is a super-massive black hole. [br] It may be inferred from the passage that jets of gas ______.
选项
A、around Sagittarius A were found quite unexpectedly
B、are common phenomena surrounding enormous black holes
C、only flow away from the centers of galaxies
D、are the true source of intense energy
答案
B
解析
根据文章第五段第二和第三句话“This expanding gas is similar in temperature,density,and com position to the jets of gas that astronomers have observed flowing away from the centers of many other galaxies.Such jets are thought to be generated by accretion disks surrounding enormous black holes,”可以推断出[B]为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3906197.html
相关试题推荐
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
随机试题
Thefirstfourdigitsofthesix-digitinitialpasswordforashopper’scardat
额定值为1W、10Ω的电阻器,使用时通过电流的限额是()。A.0.01A.B.0
以下关于负载压力测试的叙述中,不正确的是()A.负载压力测试用于确认系统是否支
患者,女,48岁。反复双手近端指间关节、膝关节痛伴晨僵2年,肘部伸侧可触及皮下结
下列哪一种物质不参与由乙酰辅酶A合成脂肪酸的反应A.CH3COCOOH B.
银行金融创新中的“四个认识”原则是指( )。A.认识你的风险 B.认识你的业
有甲、乙、丙、丁四个计算期相同的互斥型方案,投资额依次增大,内部收益率IRR依次
下列关于基因的诱导表达的叙述正确的是A.在任何环境中表达增强的过程 B.在普通
急性血源性骨髓炎后期的病理特点是A.骨质破坏、坏死 B.骨髓内脓肿 C.骨膜
下列施工方进度控制的措施中,属于技术措施的是()。A.确定进度控制的工作流程
最新回复
(
0
)