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TeachMeFinance.com - explain star star The term 'star' as it applies to the area of space can be defined as 'A ball of mostly hydrogen and helium gas that shines extremely brightly. Our Sun is a star. A star is so massive that its core is extremely dense and hot. At the high stellar core temperatures, atoms move so fast that they sometimes stick to other atoms when they collide with them, forming more massive atoms and releasing a great amount of energy. This process is known as nuclear fusion. Scientists have not yet been able to use nuclear fusion as a power source here on earth, but they are trying!'. Previous 5 Terms: standing wave Standpipe stanniferous stapediform Staple Next 5 Terms: Startup Startup test phase of nuclear power plant Startup-flame stabilization fuel Starved Electrolyte Cell stasiology About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.