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HOW DO STARS DIE?


All stars eventually run out of all there material and gases by slowly burning up all there fuel.

An average size star like our Sun will bloat in size after a life cycle of 10 billion years and turn into a red giant. Once it is a red giant it will blow off it's gases and collapse. The collapsed star will eventually fade and turn into a white dwarf which is the inner core of the star. After the white dwarf will cool down into a black dwarf which has no light or heat. It takes so long for a star to cool off into a black dwarf it is believed that no star has yet reached this stage.

A red dwarf or smaller mass star will die the same way as an average size sun like ours, except that it will not turn into a red giant and it will take billions of years longer to turn into a white and then a black dwarf.

A very large mass star called a blue giant can die similarly to other smaller stars  or it can go super nova.  The blue giant gets even hotter and brighter and turns into a red super giant and then the star collapses inward and explodes and that is called a super nova.

A supernova is a massive explosion of star dust and gases from when the star explodes. The photos scientists have of supernovae are actually of when the super nova happened millions or billions of years ago because it takes light so long to travel here from that far away. When the scientists see these super novae it is like seeing into the past.
Super nova are very bright and colorful and among the powerful events in the universe. Did you know that after a star dies and goes super nova the dust will help make new stars in the future.
A neutron star is the only thing left of the old star.

Another possibility is that it can also turn into something called a black hole which nothing can escape not even light. Light travels at 186,000 miles or 300,000 kilometers per second and it still cannot even escape, that is why a black hole looks black, because no light that goes in comes out. No person has ever seen a black hole.  A black hole sucks up matter. At the Event Horizon the gravity is so strong that nothing can escape, it's the point of no return. Did you know that in a smaller black hole by the time you got to the Event horizon you would be stretched skinny like spaghetti and then get  ripped apart by gravity pulling outward and inward. In a larger black hole it would seem more inviting because you would not get ripped apart, but it is not. You would last a little longer but you would get sucked in and get to an area that is burning hot and you would die. This is what scientists believe but don't worry it's impossible for a human to get that close to a black hole anyway and our Sun is not big enough to ever turn into a black hole.

Did you know that the biggest black holes are believed to be at the center of galaxies? They are called super massive black holes and scientists believe there is one at the center of our galaxy, The Milky Way. There is a theory that galaxies need a black hole in order to be made. Astronomers used to believe that there were all these gases that created the galaxies but they didn't know how the stars were created. Now they believe that the gases collapse inward creating a super massive black hole at the center of what will become a galaxy. When the gases rubbed against each other really fast when they were 
orbiting the black hole they heated up and turned into stars, creating galaxies.




                                                                 I drew this picture of a supernova on the computer.


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