The Big Bang How The Universe Began

998 words - 4 pages

Question 1a) Infrared AstronomyInfrared Astronomy is a study of the Infrared Radiations emitted from celestial objects. All objects from trees, buildings on the earth to distant galaxies emit infrared radiation. The cosmic dust particles block the view of the visible universe such as the center of the Milky Way but these cosmic dust particles are transparent in the Infrared Radiation wavelengths. It is very significant for studying asteroids, comets, planetary satellites and interstellar dust clouds where stars are forming. Also because of the expansion of the universe which shifts energy to longer wavelengths, most of the visible radiations emitted by stars and galaxies during early stages of the formation of the universe are now shifted to Infrared Radiation wavelength range.b) Radio WavesRadio waves have the longest wavelengths in the electromagnetic spectrum. Radio waves can be either very long or very short. Radio waves are extremely useful because they can go through the earth's atmosphere. Radio waves are produced by charged particles moving back and forth.Objects in space, such as planets and comets, giant clouds of gas and dust, and stars and galaxies, emit light at many different wavelengths. Some of the light they emit has very large wavelengths. These long waves are in the radio region of the electromagnetic spectrum. Radio telescopes gather and focus the radio waves from an object in space; the signal then returns to earth in full detail give astronomers valuable information about the planet or star. Radio astronomy has the advantage that sunlight, clouds, and rain do not affect observations.Question 2Due to the fact that 75% of the universe is filled with Hydrogen and 25% is Helium it is showing that there was a stage when the universe was the right density and temperature to create these since stars could not have produced this much of helium's and hydrogen's over the ages. Approximately 3 minutes after the Big Bang the temperature and density was the right condition for making those elements. The reason why it is only Hydrogen and Helium is because the condition didn't allow the production of elements heavier than helium.Around one second after the Big Bang, the temperature of the universe was roughly 10 billion degrees and was filled with a sea of neutrons, protons, electrons, anti-electrons (positrons), photons and neutrinos. As the universe cooled, the neutrons either decayed into protons and electrons or combined with other neutrons to make deuterium. During the first three minutes of the universe, most of the deuterium combined to make helium. Small amounts of lithium were also produced at that time. The predicted abundances of deuterium, helium and lithium depend on the density of ordinary matter in the early universe: if the density of the ordinary matter is roughly 3% of the critical density, then the theory correctly predicts the massive amounts of these elements.Question 3Quasar is one of a class of blue celestial...

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