Comets Essay -- essays research papers fc

The first compose records of comets date back to nearly 3,000 years ago from China and Europe. The accounts of these comets were believed to be the causes of terrible events that occurred afterwards. In more recent times, however, astronomers have found protrude what they really atomic number 18. A comet is basically a mixture of ices, from both weewee and frozen shove offes, and dust.     They have also been given the names dirty snowballs or icy mud balls. The typical comet is less than 10 kilometers across. They spend around of their time frozen solid in the outer parts of our solar system. Comets are composed of five parts the heart, coma, hydrogen profane, dust tail, and ion tail. The heart is pretty solid and stable, composed mostly of ice and shove along with a small amount of dust and other solids. The get up of the nucleus is trounce described as a black crust. Comet nuclei can range from 1 kilometer to about 50 kilometers across. The black c rust on the get up of the nuclei helps the comet to absorb heat, which causes some of the ices under the crust to turn to a gas. pressing builds up underneath the crust and causes the surface to bubble up in some places. Eventually, the weak spots of the crust break open from the pressure, and the gas shoots outward astronomers refer this to as a jet.Dust that had been mixed in with the gas is also pushed out, and as more jets appear, a small gas and dust shell forms around the nucleus, and this is called the coma. The coma, also called the head, is a dense cloud of water, carbon dioxide and other gases and comes off of the nucleus. They can be several railway yard kilometers in diameter, depending on the comets distance from the sun and the coat of the nucleus. The size of the nucleus is important because since large nuclei have a greater surface area facing the sun, which is the side that is the warmest, hence the side where most of the jets are coming from, it means more jets and greater amounts of gas and dust go into the coma. Even though the coma can get to be genuinely large, its size can actually decrease about the time it crosses the kitchen stove of Mars. At this distance the particles that drift out from the sun act as a powerful wind which blows the gas and dust particles away from the nucleus and coma. This is the process, which makes the comets tail. The hydrogen cloud is very large at millions of kilometers... ...elieved that the comet Hale-Bopp was spillage to cause something very bad to happen, so they all committed suicide. If volume can have a better understanding of what comets are, things like this could by chance be prevented. The roles that comets have played in the earth and in lifespan as it is today are really big and important. If it had not been for comets, thusly life could possibly not have even existed now. Also, many creatures, for pillow slip the dinosaurs, have become extinct because of the comets colliding with t he earth. If the comets had never made these creatures go extinct, so life would without a doubt be different.Works CitedFranklin, William. Small Comets. Online. Internet. available http//smallcomets.physics.uiowa.edu/Hamilton, Calvin. "Asteroid Introduction." Online. Internet. Available http//www.solarviews.com/eng/asteroid.htmLaborde, John. Comet West. Online. Internet. Available http//www.solarviews.com/cap/comet/west.htmRondlen, Michael. Comet. Online. Internet. Availablehttp//windows.ivv.nasa.gov/Sipes, Russell. Comet Hale-Bopp. Online. Internet. Availablehttp//www.sipe.com/halebopp/"Comet Hale-Bopp"