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The Stars
By Patrice P.
Birth Of A Star Stars are born in clouds of dust that get scattered across the galaxies. ''Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up.'' (NASA) The hot core at the center of the cloud is what, will one day become a star. As the cloud collapses a hot, dense core begins to gather dust. While some of the dust goes into makeing the star some of it can also go into planets, asteroids, comets or may just stay dust. (NASA)
NASA Website
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Hertzsprung-Russell (H-R) diagram is a graph that shows the life span of a star. The H-R digram is simaliar to the periodic table. When the brightness of the stars is plotted agianst their temperatures it can be seen that the stars are placed in regions. Just like the periodic table, the stars that are in the same region share the same charecteristics. As the star changes the postion on the digram changes also.
Hertzsprung-Russell (H-R) diagram
A Star's End When a star has run out of hygrogen fusion no longer occurs, therefore nuclear reactions stop. Once the nuclear reactions stop the core begins to collapse on its self and the core becomes much hotter. Hygrogen outside of the star is still present. So, hygrogen fusion out of the star still happens, forming a shell around the core. This causes the star to expand and cool, transforming the star into a red giant. The internal nuclear fires begins to become unstable. The star ends up forming a cacoon around its self made up of dust and gas. What happens next depends on the size of the star.
Chandra: X-Ray Observatory Website
"Light Echo" Illuminates Dust Around Supergiant Star
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