Universe Essay Example For Students

Universe Essay It is always a mystery about how the universe began, whether if and when it will end. Astronomers construct hypotheses called cosmological models that try to find the answer. There are two types of models: Big Bang and Steady State. However, through many observational evidences, the Big Bang theory can best explain the creation of the universe. The Big Bang model postulates that about 15 to 20 billion years ago, the universe violently exploded into being, in an event called the Big Bang. Before the Big Bang, all of the matter and radiation of our present universe were packed together in the primeval fireballan extremely hot dense state from which the universe rapidly expanded. We will write a custom essay on Universe specifically for you for only $16.38 $13.9/page Order now 1 The Big Bang was the start of time and space. The matter and radiation of that early stage rapidly expanded and cooled. Several million years later, it condensed into galaxies. The universe has continued to expand, and the galaxies have continued moving away from each other ever since. Today the universe is still expanding, as astronomers have observed. The Steady State model says that the universe does not evolve or change in time. There was no beginning in the past, nor will there be change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is the same everywhere on the large scale, at all times.2 It maintains the same average density of matter forever. There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the redshifts of distant galaxies. Redshift is a Doppler effect which states that if a galaxy is moving away, the spectral line of that galaxy observed will have a shift to the red end. The faster the galaxy moves, the more shift it has. If the galaxy is moving closer, the spectral line will show a blue shift. If the galaxy is not moving, there is no shift at all. However, as astronomers observed, the more distance a galaxy is located from Earth, the more redshift it shows on the spectrum. This means the further a galaxy is, the faster it moves. Therefore, the universe is expanding, and the Big Bang model seems more reasonable than the Steady State model. The second observational evidence is the radiation produced by the Big Bang. The Big Bang model predicts that the universe should still be filled with a small remnant of radiation left over from the original violent explosion of the primeval fireball in the past. The primeval fireball would have sent strong shortwave radiation in all directions into space. In time, that radiation would spread out, cool, and fill the expanding universe uniformly. By now it would strike Earth as microwave radiation. In 1965 physicists Arno Penzias and Robert Wilson detected microwave radiation coming equally from all directions in the sky, day and night, all year.3 And so it appears that astronomers have detected the fireball radiation that was produced by the Big Bang. This casts serious doubt on the Steady State model. The Steady State could not explain the existence of this radiation, so the model cannot best explain the beginning of the universe. Since the Big Bang model is the better model, the existence and the future of the universe can also be explained. Around 15 to 20 billion years ago, time began. The points that were to become the universe exploded in the primeval fireball called the Big Bang. The exact nature of this explosion may never be known. However, recent theoretical breakthroughs, based on the principles of quantum theory, have suggested that space, and the matter within it, masks an infinitesimal realm of utter chaos, where events happen randomly, in a state called quantum weirdness.4 Before the universe began, this chaos was all there was. At some time, a portion of this randomness happened to form a bubble, with a temperature in excess of 10 to the power of 34 degrees Kelvin. Being that hot, naturally it expanded. .ub62e6dcbc37224db8bba54b80f3a339e , .ub62e6dcbc37224db8bba54b80f3a339e .postImageUrl , .ub62e6dcbc37224db8bba54b80f3a339e .centered-text-area { min-height: 80px; position: relative; } .ub62e6dcbc37224db8bba54b80f3a339e , .ub62e6dcbc37224db8bba54b80f3a339e:hover , .ub62e6dcbc37224db8bba54b80f3a339e:visited , .ub62e6dcbc37224db8bba54b80f3a339e:active { border:0!important; } .ub62e6dcbc37224db8bba54b80f3a339e .clearfix:after { content: ""; display: table; clear: both; } .ub62e6dcbc37224db8bba54b80f3a339e { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .ub62e6dcbc37224db8bba54b80f3a339e:active , .ub62e6dcbc37224db8bba54b80f3a339e:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .ub62e6dcbc37224db8bba54b80f3a339e .centered-text-area { width: 100%; position: relative ; } .ub62e6dcbc37224db8bba54b80f3a339e .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .ub62e6dcbc37224db8bba54b80f3a339e .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .ub62e6dcbc37224db8bba54b80f3a339e .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .ub62e6dcbc37224db8bba54b80f3a339e:hover .ctaButton { background-color: #34495E!important; } .ub62e6dcbc37224db8bba54b80f3a339e .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .ub62e6dcbc37224db8bba54b80f3a339e .ub62e6dcbc37224db8bba54b80f3a339e-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .ub62e6dcbc37224db8bba54b80f3a339e:after { content: ""; display: block; clear: both; } READ: The Bank Of New York And Its History Essay For an extremely brief and short period, billionths of billionths of a second, it inflated. At the end of the period of inflation, the universe may have a diameter of a few centimetres. The

CacheessayDemon Essay-Samples Issue - Homelessness And City Life

CacheessayDemon Essay-Samples Issue - Homelessness And City LifeThe cachedessaydemon.com essay-samplesissue-homelessness-essay is about the topic 'Homelessness and city life.' It includes essays from several experts on the subject.Several essays have been written by a research team that included Rick Smith, Andy Clark, Matthew Pitts, Terri Shapiro, and Monica Shaw. Most of them show how the city life has affected them personally, such as: Kevin Marquez, born in Colorado but raised in New York City. He went on to become a risk-taker, went to jail for robbery, and became homeless.Most CacheessayDemon.com essay-samplesissue-homelessness-essay is well-written and interesting. However, one of the essays is about homelessness in particular and it is: The City Of Gates to the West. The essay talks about another possible side effect of being homeless - access to drugs. What I found surprising was how completely absent this aspect of the city life is in the essay.The CacheessayDemon.com essay -samplesissue-homelessness-essay was intended for middle school students and teachers. It was not meant for those who may be attending college, or for those who are already in college and not much interested in learning more about cities and homelessness. Instead, the main focus was on middle school students.They say you have to look at things from the perspectives of people who are homeless, then you can see the problem from different perspectives. But it should be noted that most readers may have an idea what homelessnessis, but they still want to know more about it, and are more likely to pay attention to an essay that talks about what homelessness means for the writer personally.The essay-samplesissue-homelessness-essay is also a bit of a waste of time because the writer had to write it by taking on the viewpoint of someone who was already on the street. Of course, we all know what that means. It's just that it's a bit difficult to do. It's like watching a painting on the wall o f a room that is dark, you have to understand the person who made the painting to have done it.I hope you will consider the essay-samplesissue-homelessness-essay before purchasing or downloading this essay from CacheessayDemon.com. Please don't just go ahead and download it for free thinking that you are getting the best deal. If you believe that, then you probably already know what you're getting into. This essay is worth your money because it talks about what it's like to be homeless, and it shows that you can make a difference in the world.I wish I could tell you that there was some magic potion that made it easy to write, but the reality is that it's not. You can do it if you really want to, but it's going to take work. The CacheessayDemon.com essay-samplesissue-homelessness-essay should be taken with a grain of salt because the author didn't put his own work into the essay. Take the time to actually look into the situation and find out for yourself.