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Essay on stars | ||
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This is the first 1,000 characters of 1071 words (4.28 pages) in the essay titled stars STARSA star is a large celestial body composed of gravitationally contained hot gases giving off electromagnetic radiation, especially light. The sun is actually a star. Unlike the sun the stars seem to be fixed, but in fact stars are in rapid motion, but their distances are so great no relative changes can be seen with the naked eye. The sun is a typically star, with a visible surface called a photosphere, which an atmosphere of hot gases, and above them an outflowing stream of particles called the solar (stellar) winds. Cooler spots called sunspots are likely present on other stars. We come to know this by a technique called speckle interferometry. Internal structures of the sun and other stars cannot be directly observed but some studies indicate convection currents and layers of increasing density and temperature. Stars consist mainly of hydrogen and helium, with varying amounts of other elements. Star brightness is described in terms of magnitude. The brightest star may be as much as 1,000,000 times brighter than the sun. The number of stars visible to the naked eye from earth has been estimated to a total of 8000. 4000 are visible from the Northern Hemisphere and 4000 from the Southern Hemisphere. At any time in either hemisphere only 2000 stars are visible the other 2000 are located in the daytime sky and are obscured by much brighter light. A star begins its life as a large and comparatively cool mass of... |
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Keywords: heavy hydrogen, brighter than the sun, northern hemisphere, southern hemisphere, gases, naked eye, speckle interferometry, helium, convection currents, photosphere, electromagnetic radiation, deuteron, star brightness, nuclear reaction, stellar winds, celestial body, daytime sky, interior temperature, relative changes, rapid motion