Earth Science Essay

Stars ar one of the aery bodies found in the solar system. much(prenominal) celestial object produces heat, light, and different forms of radiations much(prenominal) as x-rays and ultraviolet rays caused by its cosmic energy engines. All stars atomic number 18 make up of gas, plasma, and matters comprised of subatomic particles that be super heated. From the body politic, it whitethorn appear that stars are costly because of their radiance shining over. However, stars are actually far away that most of the scientists piss to develop companys in order to foreshadow their distance.Two of the most notable methods are the parallax proficiency and the use of Cepheid variable ( case Geographic, 2008). The parallax technique is used in order to browse the distance of the stars that are closest to the earth. overdue to the revolution of the earth to the sun, the stars that are earnest to the earth shifts position against the stars that are in farther positions. These chang es in the position of the near stars are known as the parallax shift. The parallax method functions by observing the distance of the modify process and determining the earths orbit diameter.From there, astronomers are able to regularize the parallax angle of the stars distance. The primary(prenominal) principle behind the method is that the littler the parallax shift, the farther away the star is from the earth (Windows to the Universe Team, 2000, n. p. ). Such method is entirely applicable for stars that are within the snip of few hundred light old age from earth. Thus, when stars exceed the given range, the parallax shift could be too small to be deliberate through this technique (Windows to the Universe Team, 2000).For the unnumberable distant stars that are in the range beyond 100 light long time and are in clusters found in a different galaxy, the bank notement is set through the stars situation known as Cepheid variable. Stars that have this belongings undergo a f ixed pedal where they get brighter and dimmer. This property is common among stars that are in old age (Berger, 2002, n. p. ). Because of their teemingness in space, astronomers measure their distance by determining the number of cycle when stars are bright (Berger, 2002).There are more ways to measure the distance of the stars. It may be obtained from the stars spectral properties, temperature, brightness, and luminosity. Because of the major efforts in improving the measurements of the distances of the stars, various ways are also formulated in order to determine the cosmic distance of former(a) celestial bodies present in the sky. References Berger, W. H. (2002). measuring rod distance to the stars. In Intro to astronomy Discussion of the Field of Astronomy, University of California, San Diego.Retrieved September 17, 2008 from http//earthguide. ucsd. edu/virtualmuseum/ita/06_3. shtml. National Geographic. (2008). Stars. Retrieved September 17, 2008 from http//science. national geographic. com/science/space/ earth/stars-article. html Windows to the Universe Team. (2000, September). How do astronomers measure the distance to stars? Is it accurate? University Corporation For atmospherical Research. Retrieved September 17, 2008 from http//www. windows. ucar. edu/tour/link=/kids_space/star_dist. html.