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Life Cycle of Stars What is a star? http://www.youtube.com/watch?v=vGS5_ZISl Ng What is a star? Ball of hot gas (hydrogen and helium) that gives off light Have different colors, sizes, and patterns. A star as seen from Earth. Stars When seen from the Earth, most stars appear as small points of light because they are very far away. They do not move. The Earth rotates, so we are the ones moving. Dwarf star Supergiant Star The Sun is a medium-sized star. Sizes…(continued) Sizes and Colors of Stars Stars have different sizes. White dwarf stars are about the size of Earth. Supergiant stars can be wider than 300 million miles. That is more than one thousand times the distance from Earth to the Moon. Stars can be different colors such as blue, yellow, orange, red, white, and black. Life Cycle of Stars Temperature determines color Red = coolest Blue = hottest White, yellow, orange in between Red, orange, yellow, white, blue (in order) Our Sun is ____________ 3 Factors that determine Brightness of a star 1. Size: the __________, the brighter 2. Distance from us: the ______, the brighter 3. Temperature: the _________, the brighter Compare stars and planets Similar: Different: Comparing stars to planets http://www.youtube.com/watch?v=7T1LO6n OUdw Technology used to study stars 1. Telescope – founded by Leonardo da Vinci around 1600. What is the most Famous telescope? Answer The Hubble Telescope Constellations Patterns of stars: What is this one called? Constellation This is my favorite constellation. What is it? What is the most appreciated star? Answer Polaris Also known as the North Star Do stars move? Answer It depends….. http://www.youtube.com/watch?v=uUuVMhp4pA http://www.universetoday.com/85730/dostars-move/ How are stars like people? Answer on the next slide Answer We both are born We both die Do we come from stars? Really? answer http://imagine.gsfc.nasa.gov/docs/ask_astro/a nswers/050921a.html Life and death of a star video http://www.youtube.com/watch?v=4elLkaeLq ZQ The End I hope you enjoyed the show.