When we look at the sky, what do we see? During the day we will often find the sun. The sun is much more than a fireball that we see in our daily lives. The sun gives life to the earth, from the condition of the season of life that is produced. Overall, when we think of the sun we think of heat and light, but you might ask; How does the sun produce the heat and light the earth needs to support life? The sun is also known as a star, just like the stars we see at night and which illuminate the night sky. Stars are classified according to the stellar classification system, which takes into account the appearance of a star's light spectra. According to the chart, the sun is considered a G2 V, G-class stars have a temperature between “5,200 and 6,000 K and have a weaker hydrogen line and neutral metals” (“Stellar Classification,” 2014). A common name for the sun is a dwarf star, and “the V classification indicates that the sun is a main sequence star and generates energy through nuclear fusion” (“Sun,” 2014). Similar to the structure of the Earth, the sun is made up of an inner core and an atmosphere, understanding the structure of the sun will help you understand how heat and light are produced. The innermost part of the sun is known as "the core". The sun's core helps initiate the generation of heat and light, which fuels life on Earth. The innermost portion of the sun has the highest temperature and greatest pressure. Based on the sun's category in stellar classification, it is made up of hydrogen and generates energy from nuclear fusion. The nuclear fusion reaction is “when two or smaller light nuclei combine to form a larger nucleus” (Young, 2012). Hydrogen atoms perform nuclear fusion… middle of paper… May 11, 2014, from http://solarscience.msfc.nasa.gov/interior.shtml9. Cttaneo, F., Brummell, N., Rosner, B., Malagoli, A., Hughes, D., Schuessler, M., et al. (2013). The convection zone. . Retrieved May 9, 2014, from http://www.cora.nwra.com/~werne/eos/text/convection_zone.html#trip10. Ship, C. (2014). Hyperphysics. Hyperphysics concepts. Retrieved May 11, 2014, from http://hyperphysics.phy-astr.gsu.edu/hbase/hph.html11. Cohen, H. (n.d.). From Core to Corona. . Retrieved May 9, 2014, from http://fusedweb.llnl.gov/cpep/chart_pages/5.plasmas/sunlayers.html12. “What causes the seasons?” April 01, 2000. HowStuffWorks.com. May 11, 2014.13. Greenhouse gases, climate change and energy. (2004, April 2). . Retrieved May 10, 2014, from http://www.eia.gov/oiaf/1605/ggccebro/chapter1.html