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Recently,scientists produced the first real image of a black hole, shining a light onone of the universe’s great mysteries, in a galaxy called Messier 87. The image is not a photograph but an image created by the Event Horizon Telescope (EHT)project. Using a network of eight ground-based telescopes across the world, the EHT collected data to produce the image. The black hole itself is unseeable, as it’s impossible for light to escape from it; what we can see is its even thorizon. The EHT was also observing a black hole located at the centre of the Milky Way, but was unable to produce an image. While Messier 87 is furtheraway, it was easier to observe, due to its larger size.The golden ring is the event horizon, the moment an object approaching a black hole reaches a point of no return, unable to escape its gravitational pull. Objects that pass into the event horizon are thought to go through spaghettification（意大利面条化）,a process, first described by Stephen Hawking, in which they will be stretchedout like a piece of pasta by gravitational forces.Heino Falcke,professor of radio astronomy and astroparticle physics at Radboud University in Nijmegen, and chair of the EHT science council, says the image shows asilhouette（剪影）of the hole against the surrounding glow of the event horizon, all of the matter being pulled into the hole. At the centre of the black hole is a gravitational singularity, where all matter is crushed into aninfinitely small space. The black hole lies 55m light years away from us. It is around 100bn km wide,larger than the entire solar system and 6.5bn times the mass of our sun.Through creating an image of a black hole, something previously thought to be impossible, the EHT project has made a break through in the understanding ofblack holes, whose existence has long been difficult to prove. The image will help physicists to better understand how black holes work and images of the event horizon are particularly important for testing the theory of general relativity.1.What’s the text mainly about?A.The image of a black hole.B.The photo created by the EHT.C.The event horizon of the black hole.D.The introduction of the EHT project.2.How does EHT collect data?A.By producing the image of a black hole.B.By studying the golden ring in the photo.C.By observing the center of the Milky Way.D.By using a network of eight ground-based telescopes.3.What do we know about the black hole from the text?A.Its image shows a silhouette of the event horizon.B.There is a possibility that light can escape from it.C.All matter is crushed into small space at its centre.D.Objects will be stretched out outside the event horizon.4.What does the last paragraph mainly present?A.Creating an image of a black hole is thought to be impossible.B.It’sstill hard for physicists to prove the existence of the black hole.C.The image will help physicists to test the theory of general relativity.D.The image of a black hole created by EHT project is highly significant.。
黑洞的大一英语演讲正文第一篇：黑洞的大一英语演讲General relativity predicts a particularly dense dark objects. Evolution of massive stars in their late collapse occurs, the dense material in particular, it has one called event horizon of the closed border, a black hole hidden in a huge gravitational field, due to the gravitational field so strong, including in particular photon光量子 (the composition of light particles粒子), including any material can only be entered could not escape. The formation of a black hole minimum mass star's core is about three times the solar mass质量, of course, this is the last star of nuclear quality, rather than main sequence stars in the period of quality. In addition to this stellar-class black hole, there are other sources of black holes - the so-called micro-black holes may be formed in the early universe, the so-called supermassive black holes may exist in the central galaxy. A black hole can be found through the concept of electronic equipment.(laser light for instance) The black hole within its borders to prevent any outsiders to see anything, which is the object knownas the black hole of the reason. We were unable to observe the reflection of light it can only be affected indirectly understand the objects around the black hole. Having said that, but the black hole still has its borders, namely event horizon (horizon).The ergosphere(能层，黑洞周围假设区) is an oblate spheroid region outside of the event horizon, where objects cannot remain stationary.It is assumed that the evolution of stellar black hole of death matter, is in a special super-massive stars collapse generated. In addition, the quality of a black hole must be larger than the Chandrasekhar limit of stellar evolution to the end of the form, quality, smaller than the Chandrasekhar limit of the star is unable to form a black hole.Next introduce one famous formula ,it was declared by Hawking to describe the black hole’s state.The formula for the Bekenstein–Hawking entropy (S) of a black hole, which depends on the area of the black hole (A). The constants are the speed of light (c), the Boltzmann constant (k), Newton's constant (G), and the Planck constant (hFinally, present you a picture of the black hole . 第二篇：黑洞班会演讲稿班会演讲稿1：太空中的一切都是奇妙的，充满生机的地球；浩瀚火热的太阳！还有那明镜的月亮！2：对！太空是美丽的，无边无际的，那——黑洞呢？1、2：主题班会黑洞之谜，开始！1：请欣赏科幻小品,穿越黑洞！……2：黑洞是一个可怕的地方。
