Recently discovered by the Astronomers, how many super-earths are present in the new secret planetary system (HD219134)? ?->(Show Answer!)

1. Recently discovered by the Astronomers, how many super-earths are present in the new secret planetary system (HD219134)?

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MCQ->Recently discovered by the Astronomers, how many super-earths are present in the new secret planetary system (HD219134)?....

MCQ-> In the modern scientific story, light was created not once but twice. The first time was in the Big Bang, when the universe began its existence as a glowing, expanding, fireball, which cooled off into darkness after a few million years. The second time was hundreds of millions of years later, when the cold material condensed into dense suggests under the influence of gravity, and ignited to become the first stars.Sir Martin Rees, Britain’s astronomer royal, named the long interval between these two enlightements the cosmic ‘Dark Age’. The name describes not only the poorly lit conditions, but also the ignorance of astronomers about that period. Nobody knows exactly when the first stars formed, or how they organized themselves into galaxies — or even whether stars were the first luminous objects. They may have been preceded by quasars, which are mysterious, bright spots found at the centres of some galaxies.Now two independent groups of astronomers, one led by Robert Becker of the University of California, Davis, and the other by George Djorgovski of the Caltech, claim to have peered far enough into space with their telescopes (and therefore backwards enough in time) to observe the closing days of the Dark age.The main problem that plagued previous efforts to study the Dark Age was not the lack of suitable telescopes, but rather the lack of suitable things at which to point them. Because these events took place over 13 billion years ago, if astronomers are to have any hope of unravelling them they must study objects that are at least 13 billion light years away. The best prospects are quasars, because they are so bright and compact that they can be seen across vast stretches of space. The energy source that powers a quasar is unknown, although it is suspected to be the intense gravity of a giant black hole. However, at the distances required for the study of Dark Age, even quasars are extremely rare and faint.Recently some members of Dr Becker’s team announced their discovery of the four most distant quasars known. All the new quasars are terribly faint, a challenge that both teams overcame by peering at them through one of the twin Keck telescopes in Hawaii. These are the world’s largest, and can therefore collect the most light. The new work by Dr Becker’s team analysed the light from all four quasars. Three of them appeared to be similar to ordinary, less distant quasars. However, the fourth and most distant, unlike any other quasar ever seen, showed unmistakable signs of being shrouded in a fog because new-born stars and quasars emit mainly ultraviolet light, and hydrogen gas is opaque to ultraviolet. Seeing this fog had been the goal of would-be Dark Age astronomers since 1965, when James Gunn and Bruce Peterson spelled out the technique for using quasars as backlighting beacons to observe the fog’s ultraviolet shadow.The fog prolonged the period of darkness until the heat from the first stars and quasars had the chance to ionise the hydrogen (breaking it into its constituent parts, protons and electrons). Ionised hydrogen is transparent to ultraviolet radiation, so at that moment the fog lifted and the universe became the well-lit place it is today. For this reason, the end of the Dark Age is called the ‘Epoch of Re-ionisation’. Because the ultraviolet shadow is visible only in the most distant of the four quasars, Dr Becker’s team concluded that the fog had dissipated completely by the time the universe was about 900 million years old, and oneseventh of its current size.In the passage, the Dark Age refers to
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MCQ-> Read the following passage carefully and answer the question given below it Certain words/phrases have been printed in bold to help you locate them while answering some of the questionsOnce a king saw some young boys pelting stones on a snake. He prevented the boys from killing the snake. Thus he saved its life.The snake, which was the King of the Snake World, thanked him and favoured him with a supernatural gift by which he could understand the language of any animal. But he warned him that that divulgence of the secret would cost him his life. One day, when the King was sitting in his garden and enjoying breakfast, a small portion of the sweet fell on the ground.Soon he heard an ant shouting, “My God”, what a big wagon-ful of sweet has fallen and there is none to consume it.Ah ! I can enjoy all, now.”Hearing this, the King smiled and chuckled.The queen, who was sitting next to him,was curious to note the changing countenance of the King.She asked him to tell her the reason for the smile. But the King kept silence,she attacked his self-respect by calling him a “liar” and muttered that all his expressions of endearment like-You are dearer to me than my very life”.-were nothing but a pack of lies.The King, however,could not bear the attacks on his self-respect and eventually conceded to divulge the secret on the following day in the royal,garden; and made up his mind to sacrifice his life. A donkey overheard the King’s resolve and decided to save him,because the King was righteous.So, he picked up one of his friends-the goat and they both decided to save the King. Next day, when the King and his retinues were on the way to the royal park,the donkey and the goat stood conversing on one side of the path.The King overheard the goat saying to the donkey, “You are a fool but not as big a fool as in the king. “Having heard so, the King was curious to know as to why was he being called a “bigger fool”. So, he said to the goat. “Pray, then tell me what to do as I am now committed to tell her on her back”. When the King reached the garden he said to the queen “I am now ready to tell you the secret on the condition that you are willing to receive one hundred lashes in return”.The queen considered the condition a joke and nodded in agreement.The King then waved at one of his guards to lash her with all his power.And no sooner than she received two lashes she wailed and shouted “No ! No ! Stop, do not lash me ! I don’t want to know the secret now”. The King then said scornfully, “You wanted to know the secret at the cost of my life, but now you don’t want to know because you have to save your skin.You deserve a few more lashes.”But before he could order his man to give her a few more lashes, the King’s trustworthy minister intervened and requested him to forgive her.Thus the queen was not lashed further, yet she received the same honour and dignity.Why did the snake give a gift to the King ?
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MCQ->What will be the output of the program? class Super { public Integer getLength() { return new Integer(4); } } public class Sub extends Super { public Long getLength() { return new Long(5); } public static void main(String[] args) { Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLength().toString() + "," + sub.getLength().toString() ); } }....

MCQ-> The passage given below is followed by a set of three questions. Choose the most appropriate answer to each question.The difficulties historians face in establishing cause-and-effect relations in the history of human societies are broadly similar to the difficulties facing astronomers, climatologists, ecologists, evolutionary biologists, geologists, and palaeontologists. To varying degrees each of these fields is plagued by the impossibility of performing replicated, controlled experimental interventions, the complexity arising from enormous numbers of variables, the resulting uniqueness of each system, the consequent impossibility of formulating universal laws, and the difficulties of predicting emergent properties and future behaviour. Prediction in history, as in other historical sciences, is most feasible on large spatial scales and over long times, when the unique features of millions of small-scale brief events become averaged out. Just as I could predict the sex ratio of the next 1,000 newborns but not the sexes of my own two children, the historian can recognize factors that made2 1 inevitable the broad outcome of the collision between American and Eurasian societies after 13,000 years of separate developments, but not the outcome of the 1960 U.S. presidential election. The details of which candidate said what during a single televised debate in October 1960 Could have given the electoral victory to Nixon instead of to Kennedy, but no details of who said what could have blocked the European conquest of Native Americans. How can students of human history profit from the experience of scientists in other historical sciences? A methodology that has proved useful involves the comparative method and so-called natural experiments. While neither astronomers studying galaxy formation nor human historians can manipulate their systems in controlled laboratory experiments, they both can take advantage of natural experiments, by comparing systems differing in the presence or absence (or in the strong or weak effect) of some putative causative factor. For example, epidemiologists, forbidden to feed large amounts of salt to people experimentally, have still been able to identify effects of high salt intake by comparing groups of humans who already differ greatly in their salt intake; and cultural anthropologists, unable to provide human groups experimentally with varying resource abundances for many centuries, still study long-term effects of resource abundance on human societies by comparing recent Polynesian populations living on islands differing naturally in resource abundance.The student of human history can draw on many more natural experiments than just comparisons among the five inhabited continents. Comparisons can also utilize large islands that have developed complex societies in a considerable degree of isolation (such as Japan, Madagascar, Native American Hispaniola, New Guinea, Hawaii, and many others), as well as societies on hundreds of smaller islands and regional societies within each of the continents. Natural experiments in any field, whether in ecology or human history, are inherently open to potential methodological criticisms. Those include confounding effects of natural variation in additional variables besides the one of interest, as well as problems in inferring chains of causation from observed correlations between variables. Such methodological problems have been discussed in great detail for some of the historical sciences. In particular, epidemiology, the science of drawing inferences about human diseases by comparing groups of people (often by retrospective historical studies), has for a long time successfully employed formalized procedures for dealing with problems similar to those facing historians of human societies. In short, I acknowledge that it is much more difficult to understand human history than to understand problems in fields of science where history is unimportant and where fewer individual variables operate. Nevertheless, successful methodologies for analyzing historical problems have been worked out in several fields. As a result, the histories of dinosaurs, nebulae, and glaciers are generally acknowledged to belong to fields of science rather than to the humanities.Why do islands with considerable degree of isolation provide valuable insights into human history?
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