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Diagram a comet Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 20 80 160 90 170 150 100 110 1 http://media.nasaexplores.com/lessons/01-072/images/cometdiag.gif Describe GALAXY Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 20 80 160 90 170 150 100 110 1 A galaxy contains stars, gas, and dust which are held together as a group by gravity. There may be millions, or even billions, of stars in one galaxy. There are billions of galaxies in the universe. How are galaxies classified? 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 20 160 90 150 170 100 110 180 Seconds Remaining: Galaxies are classified according to their shape. Some galaxies are called "spiral", because they look like giant pinwheels in the sky. The galaxy we live in, the Milky Way, is a spiral galaxy. Some galaxies are called “elliptical", because they look like flat balls. A galaxy may be called "irregular" if it doesn't really have a shape. A new type of galaxy was discovered recently, called a "starburst" galaxy. In this type of galaxy, new stars just seem to 'burst out' very quickly. http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level1/galaxies.html Describe STAR Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 80 20 160 90 150 170 100 110 1 • A star is a brilliantly glowing sphere of hot gas whose energy is produced by an internal nuclear fusion process. Stars are contained in galaxies. http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level2/stars.ht ml What is the HertzsprungRussell Diagram? Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 80 20 160 90 150 170 100 110 1 • A tool that shows relationships and differences between stars. It shows stars of different ages and in different stages Diagram the life cycle of a star Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 80 20 160 90 150 170 100 110 1 www.seasky.org/cosmic/sky7a01.html Describe the types of stars Seconds Left: 140 120 130 30 40 50 60 70 10 2 3 4 5 6 7 8 9 0 180 80 20 160 90 150 170 100 110 1 • Main Sequence Stars - maintains a stable nuclear reaction. • Red Giants - a large star that is reddish or orange in color. It represents the late phase of development in a star's life, when its supply hydrogen has been exhausted and helium is being fused • White Dwarfs - the remnant of an averagesized star that has passed through the red giant stage of its life. After the star has used up its remaining fuel.