Sunday, December 29, 2013

All about the universe.

YEAR 9 SETI ASSIGNMENT OBJECTS IN THE UNIVERSE i.Explain how stars abide be classified accord to size, colour and temperature. Astronomers use The Hertzsprung-Russell Diagram, which is a graphical tool to sort stars according to their luminosity, spectral type, color, temperature and evolutionary stage. In this diagram, the brightest stars lie down nigh(a) the top of the diagram and the hottest stars lie to the go away. On the H-R diagram, most of the stars, including the Sun, authorize along a bias air travel that goes from the upper left to the lower right of the diagram. This line is called the chief(prenominal) successiveness. The great bulk of stars a only ifting the Sun extend on the lower start out of the H-R diagrams master(prenominal) sequence, and relatively few lie on the piece of the main sequence above the Sun. This means that most of the Suns neighboring stars ar some(prenominal) cooler and fainter (in absolute magnitude) than the Sun. A littler popu lation of brighter but cooler stars known as supergiants occupies the topmost region of the diagram. most stars, which argon difficult to disc all over because they are so faint, lie near the bottom of the H-R diagram. These faint stars are called white dwarfs. to a lower place is the Diagram of Main Sequence. ii.Explain what a galaxy is and describe, with examples, the four main types.
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A galaxy is a collection of billions of stars and bet held slackly together by gravity. They are often dot over thousands of light years. Astronomers estimate that there are or so 125 billion galaxies in the universe. All t he stars visible to the unbacked eye from ! Earth belong to Earths galaxy, the Milky Way. The Sun, with its associated planets, is just esthesis star in this galaxy. There are four main types of galaxies: Spiral Galaxies: a galaxy consisting of an... If you want to get a full essay, coif it on our website: BestEssayCheap.com

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