Star Presentation
Transcript: How I wonder ... Maddison Brown Stars What is a star? A star is a luminious ball of gas, that is mostly hydrogen and helium, held together by its own gravity (Temming, 2014). Factors such as age, disturbution, and composition of stars in a galaxy detect the histroy, dynamics, and evolution of that specfic galaxy (NASA). To better understand stars I will discuss the following topics. 1. Formulation 1. Formulation How a star is formed? What makes a star glow? How many stars are there in our galaxy? 2. Classifications 2. Classifications How are stars classified? What are some of the different types of stars? What is the biggest star recorded? 3. Lifespan 3. Lifespan What is the life expency of a star? What happens to a star when it dies? Formulation 1 Formulation 1 How is a star formed ? How is a star formed? Stars are born as clumps within gigantic clouds of dust and is scattered throughout galaxies. Turbulance deep within the clouds give rise to knots with sufficent mass that the gas and dust begin to collapse under it's own gravitational attraction. As the clouds collapses, the material in its core begins to heat up and its from this heat that later causes it to one day become a star. (NASA) What causes a star to glow? What causes a star to glow? Because stars are so massive, the density and pressure in the cores are extremely high. The Sun's core is so hot and has such high pressure that it undergoes nuclear fusion. The core of the sun converts hydrogen into helium. This conversion first reaction that happens in every star. This reaction ends up with a surplus of energy, this is beaucse the mass of the combing hydrogen is greater that the end product of helium. The mass is converted to energy, and that energy is the electromagnetic radiation (light) that we get bounce off from the Sun. (Learning Astonomy) ESA/Hubble, and NASA. “Nasa.gov.” Nasa.gov, NASA, 5 Aug. 2016, www.nasa.gov/sites/default/files/thumbnails/image/hubble_friday_08052016.jpg. How many stars are there in our galaxy? There are roughly as few as 200 billion stars in the Milky Way (Trosper, 2017). How many stars are there in our galaxy? Fun Fact Each galaxy contains hundreds of billions of stars and there is estimated to be over 100 billion galaxies in the universe. The total number of stars in the universe estimated to be at least 70 sextillion and possibly as high as 300 sextillion ("Fun Star Facts for Kids"). NASA. “Astronomos.org.” Astronomos.org, Perplejo, 30 Dec. 2012, www.astronomos.org/no-estamos-solos-dijo-hubble/. 2 Classifications 2 Classifications How are stars classified? Stars are classfied by their spectra, the elements they absorb, and thier tempeture. There are seven main types of stars. Listed in the order of decreasing temperature there's the O, B, A, F, G, K, and M. M stars are common and dim. O and B stars are less common and bright . (Star Classification) How are stars classified? “Morgan-Keenan Spectral Diagram.” Commons.wikimedia.org, Wikimedia Commons, 5 Sept. 2006, commons.wikimedia.org/wiki/File:Morgan-Keenan_spectral_classification.png#/media/File:Morgan-Keenan_spectral_classification.png. What are some of the different stars? Protostar What are some of the different types of stars? T Tauri Star Red Giant Star Main Sequence Star White Dwarf Star Red Dwarf Star Neutron Star Supergiant Star www.ck12.org/c/earth-science/main-sequence-star-lives/. “Nasa.gov.” Nasa.gov, NASA, 3 Mar. 2015, www.nasa.gov/content/goddard/sdo/pretty-prominence. “Sceincewala.blogspot.org.” Sceincewala.blogspot.org, Oct. 7ADAD, sciencewala.blogspot.com/2015/07/white-dwarf.html. NASA. “Cryengine.com.” Cryengine.com, 20 Dec. 2015, https://www.cryengine.com/community_archive/viewtopic.php?f=309&t=132918 . NASA. “Spaceanswers.com.” Spaceanswers.com, Gemma Lavendar, 23 Feb. 2015, www.spaceanswers.com/deep-space/what-is-a-t-tauri-star/. “Spaceanswers.com.” Spaceanswers.com, Wikimedia Commons, 3 Jan. 2013, www.spaceanswers.com/deep-space/red-dwarfs-the-fascinating-stars-that-live-for-trillions-of-years/. “Davidreneke.com.” Davidreneke.com, www.davidreneke.com/supergiant-star-discovered-in-the-wild-blue-yonder/. “Commons.wikimedia.org.” Commons.wikimedia.org, Wikimedia Commons, 23 Mar. 2009, commons.wikimedia.org/wiki/File:Neutron_star_illustrated.jpg. What is the largest known star in the galaxy? What is the largest known star in the galaxy? VY Canis Majoris “Wikipedia.org.” Wikipedia.org, Wikimedia Commons, en.wikipedia.org/wiki/VY_Canis_Majoris. Lifespan 3 Lifespan 3 What is the life expectancy of a star? What is the life expectancy of a star? About 10 billion years “Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion. A star with a mass like the Sun, on the other hand, can continue fusing hydrogen for about 10 billion years.” ( Temming, 2014) What happens to a star when it dies? What happens to a