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Cluster of old Stars: Red Giant
Transcript of Cluster of old Stars: Red Giant
- Its name is derived from the Arabic word bat al-dshauzâ, which means “the giant’s shoulder.”
-The star is approximately 640 light-years from Earth.
-Betelgeuse is roughly 950 times the size of our sun.
-If the sun were replaced by Betelgeuse, the planets out to the orbit of Mars would be engulfed by the star.
-It is predicted that this star will enter into supernova in the next 5,000 years. This will easily be seen from earth.
- Betelgeuse is the closest star in the Red Giant phase of its life to earth. - The size of a star will determine what will happen to it after the red giant stage. -A large star will undergo a supernova explosion. If the remnant of the explosion is 1.5 to 3 times as big as our Sun, it will become a neutron star. If it is 3 times the mass of our Sun or larger it will become a black hole. -For smaller stars, after the helium has fused into carbon at the core the core collapses again. When this happens the outer layers of the star are ejected and planetary nebula is formed. The core remains as a white dwarf and eventually cools to become a black dwarf. -The Hertzsprung-Russell (HR) Diagram is a tool that astronomers use to classify stars according to their luminosity, color, temperature and stage of life. http://www.encyclopedia.com/topic/red_giant.aspx