首页
登录
职称英语
(1)Scientists say Chandra provides first evidence that two mysteries can coe
(1)Scientists say Chandra provides first evidence that two mysteries can coe
游客
2023-11-25
30
管理
问题
(1)Scientists say Chandra provides first evidence that two mysteries can coexist in one galaxy.
(2)In a very bright galaxy 400 million light-years away, two black holes are drifting toward each other and in millions of years will merge with an eruption of energy and a burst of gravitational waves that could warp the very fabric of space, astronomers said Tuesday.
(3)The Scientists said the Chandra X-ray Observatory has found the first evidence that two immense black holes can coexist in the same galaxy and mat they are moving toward each other for an eventual merger.
(4)The double black holes were found in a bright, highly active galaxy known as NGC6240, about 400 million light-years from the Earth.
(5)Astronomers studied NGC6240 because it produced unexplained bursts of X-rays that appeared to come from one of two nuclei at the galactic center. Images collected by radio, infrared and optical observations showed two bright spots, but did not pinpoint the origin of the X-rays.
(6)When Chandra, with its sensitive X-ray detectors, focused on the nuclei, astronomers hoped it would tell them whether either of the two points of activity were black holes.
(7)"Much to our surprise, we found that both were active black holes," Stefanie Komossa of the Max Planck Institute in Germany, said in a statement.
(8)"Finding two black holes in one galaxy," said Komossa, "supports the idea that black holes can grow to enormous masses in the centers of galaxies by merging with other black holes."
(9)An artist’s conception shows two black holes whirling around each other at the center of a galaxy.
(10)Guenther Hasinger, also of Max Planck, said the Chandra images captured the unmistakable markings of two black holes—high-energy photons swirling around the dense black hole centers and X-rays spewing out from iron atoms being pulled into the center at a high rate of speed.
(11)Komossa and Hasinger are co-authors of a study submitted for publication in the Astrophysical Journal Letters.
(12)The two black holes in NGC6240 are now about 3,000 light-years apart and are expected to merge some time in the next few hundred million years, the researchers said. The merger will be accompanied by an eruption of radiation and a burst of gravitational waves that will spread throughout the universe, causing ripples in me fabric of space, the astronomers said.
(13)The gravitational ripples could cause minute changes in the distance between any two points in the universe, they said.
(14)In another study, French and Argentine astronomers said that observations by the Hubble Space Telescope and ground-based telescopes have detected a stellar black hole streaking across the Milky Way at about 250,000 miles an hour. A companion star is being dragged along and slowly devoured by the black hole, according to scientists at the French Atomic Energy Commission and me Institute for Astronomy and Space Physics in Argentina.
(15)The astronomers said the stellar black hole may have been created by an exploding star in the inner disk of the Milky Way. The black hole is 6,000 to 9,000 light years away, me researchers said. A report on the observations appears Tuesday in me journal Astronomy and Astrophysics.
(16)A black hole is a point in space that is so dense with matter mat its gravitational field will not let anything—not even light—escape. Stellar black holes, equal to 3.5 to about 15 solar masses, can be formed by the collapse of a single massive star. But galactic black holes, such as those in NGC6240, are much larger, equal perhaps to millions of solar masses, and are usually at the center of galaxies. The Milky Way, home galaxy of the sun and its planets, is thought to have a black hole at its center. With its immense gravitational pull, a black hole can suck in gas, dust and other matter from the surrounding space. Entire stars can be stripped and pulled into the bottomless maw. As it spirals in at near light speeds, matter captured by a black hole heats by millions of degrees and gives out intense radiation in several parts of me spectrum, including X-rays. The orbiting Chandra observatory is able to detect these X-rays and relay the data to Earth for study by astronomers. [br] According to the passage, NGC6240 _____.
选项
A、is a black hole 400 million light-years from the Earth
B、has two black holes coexisting and moving towards each other
C、consists of two black holes mat are already merging with each other
D、is the home galaxy of me solar system with the sun and its planets
答案
B
解析
第1-4段讲述了在一个距地球4亿光年的明亮星系内,两个黑洞正在互相靠近,该星系被命名为NGC6240,只有B符合原文表述。
转载请注明原文地址:https://tihaiku.com/zcyy/3218612.html
相关试题推荐
PASSAGETHREE[br]Whatisthescientists’attitudetowardsthestudypublished
(1)Governmentscientistslistedformaldehyde(甲醛)asaCarcinogen,substancet
(1)Governmentscientistslistedformaldehyde(甲醛)asaCarcinogen,substancet
(1)Howdowerecognizefearinanotherperson?Scientistshavelongknownth
PASSAGETHREE[br]Whatprovestwoblackholescancoexistinonegalaxy?Chandra
PASSAGEONE[br]In"...,andtherewasacertainamountofevidencetobackhim
Wildlifeconservationistssaythecoverthatfoliageprovidesforanimalsisequ
Becauseoftherisingcostoffuel,scientistsarebuildingautomobileenginesw
TheInternetprovidesanamazingforumforthefreeexchangeofideas.Give
TheInternetprovidesanamazingforumforthefreeexchangeofideas.Give
随机试题
Forthispart,youareallowed30minutestowriteanessaycommentingonthesa
新闻报道的客观性原则,指的是新闻报道者应力求排除主观成见或立场、情感因素的影响,
一个边长为1的正方体能刨成的最大的正四面体体积为:()A. B. C.1
关于麻醉中药的管理制度,以下叙述错误的是A.麻醉药品专用处方应由药剂科留存3年备
气闭的主要表现是()。A.四肢厥冷 B.昏厥 C.小腹坠胀 D.面色
甲公司以定向增发股票的方式购买同一集团内另一企业持有的A公司80%股权。为取得该
房地产市场划为现房市场和期房市场,其分类依据为()。A.房地产档次 B.买
第二产程所需时间应为A.初产妇2小时,经产妇1~2小时 B.初产妇不超过1小时
在我国现行的夫妻财产制中,()是对夫妻在婚姻关系存续期间所得财产以及婚前财产所有
某公司拟从国外进口一套机电设备,重量为1000t,离岸价为500万美元。国际运费
最新回复
(
0
)