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
2023-12-21
60
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] According to the passage, which of the following is TRUE?
选项
A、Energy only emits from Sagittarius A.
B、There are many strong energy sources.
C、Energy comes from a black hole.
D、Energy emits from any regions surrounding Sagittarius A.
答案
B
解析
由文章第二段第一句话“Observations have shown that many strong energy sources lie at the heart of the Milky Way”,可知[B]为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3291638.html
相关试题推荐
Lunarsight-seeingtripsandorbitingspacehotelsarewithinreach,moonwal
Lunarsight-seeingtripsandorbitingspacehotelsarewithinreach,moonwal
Lunarsight-seeingtripsandorbitingspacehotelsarewithinreach,moonwal
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
Lunarsight-seeingtripsandorbitingspacehotelsamwithinroach,moonwalk
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
TheFamilyThenandNow Thingswerenevereasywithinthefam
随机试题
Oneofthemostimportantsocialdevelopmentsthathelpedtomakepossiblea
______constitutestheUK.A、GreatBritainandIrelandB、TheBritishIslesandthe
Iamonlytoowillingtoserveyou.___________________________我非常愿意为你效劳。onlyto
[originaltext]Almost20,000whaleshavebeenslaughteredsinceabanoncom
TopicTheImportanceofMutualUnderstandingForthispart,youareallowe
Thechangeinthatvillagewasmiraculou
经皮吸收制剂的特点错误的是A.加入吸收促进剂也很难改变经皮给药制剂吸收差的缺点B
被誉为意大利文艺复兴“三杰”的是( )。A、达.芬奇、米开朗基罗、拉斐尔 B
根据《森林法》,下列有关森林权属错误的是( )。A.林地和林地上的森林、林木的
关于医德情感,正确的说法是A.它与医德义务无关 B.它应能满足病人的一切需要
最新回复
(
0
)