Page 27 - COSMOS & H -Health - Science
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Have you ever wondered what happens to a star when it
                                Have you ever wondered what happens to a star when it
                                Have you ever wondered what happens to a star when it
                                explodes? Why does it explode? And many more questions
                                explodes? Why does it explode? And many more questions
                                explodes? Why does it explode? And many more questions
                                left unanswered. When stars explode, we experience a
                                left unanswered. When stars explode, we experience a
                                left unanswered. When stars explode, we experience a
                                certain phenomena known as a SUPERNOVA. This
                                certain phenomena known as a SUPERNOVA. This
                                certain phenomena known as a SUPERNOVA. This
                                phenomena may seem beautiful and visually pleasing for
                                phenomena may seem beautiful and visually pleasing for
                                phenomena may seem beautiful and visually pleasing for
                                the eyes but they are threatening to the planet.
                                the eyes but they are threatening to the planet.
                                the eyes but they are threatening to the planet.

        What is a Supernova?
        What is a Supernova?
       What is a Supernova?
                                   c
                                                   p
                            s
        A supernova is the colossal explosion of a
            u
                                                        s
                                                      o
       A A     s u p e r n o v a     i i s     t t h e     c o l l o s s a l l     e x p l l o s i i o n     o f f     a
                                           s
                                            a
       A supernova is the colossal explosion of a
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       s s t t a r . .     S c i i e n t t i i s t t s     h a v e     i i d e n t t i i f f i i e d     s e v e r a l l     t t y p e s
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        star. Scientists have identified several types
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       star. Scientists have identified several types
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        of supernova. One type, called a “core-
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       of supernova. One type, called a “core-
                                                             s
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       c c o l l l l a p s e ”     s u p e r n o v a , ,     o c c u r s     i i n     t t h e     l l a s t t     s t t a g e
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        collapse” supernova, occurs in the last stage
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       collapse” supernova, occurs in the last stage
       i i n     t t h e     l l i i f f e     o f f     m a s s i i v e     s t t a r s     t t h a t t     a r e     a t t     l l e a s t t
                   e
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        in the life of massive stars that are at least
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       in the life of massive stars that are at least
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       e e i i g h t t     t t i i m e s     l l a r g e r     t t h a n     o u r     S u n . .     A s     t t h e s e
                                                         s
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        eight times larger than our Sun. As these
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       eight times larger than our Sun. As these
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       stars burn the fuel in their cores, they
       s s t t a r s     b u r n     t t h e     f f u e l l     i i n     t t h e i i r     c o r e s , ,     t t h e y
                                       h
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        stars burn the fuel in their cores, they
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        produce heat. This heat produces pressure
                                           p
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       p p r o d u c e     h e a t t . .     T h i i s     h e a t t     p r o d u c e s     p r e s s u r e
          r
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       produce heat. This heat produces pressure
                                                            c
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       t t h a t t     p u s h e s     o u t t w a r d     a g a i i n s t t     t t h e     f f o r c e s     o f f
                              w
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        that pushes outward against the forces of
       that pushes outward against the forces of
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       g g r a v i i t t y     t t h a t t     p u l l l l     i i n w a r d     o n     t t h e     s t t a r . .     F o r
                                   w
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                                                             F
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        gravity that pull inward on the star. For
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       gravity that pull inward on the star. For
            s
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                                                                   a
                                                 a
       m m o s t t     o f f     t t h e     l l i i f f e     o f f     a     s t t a r , ,     i i n w a r d     g r a v i i t t y     a n d
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       most of the life of a star, inward gravity and
        most of the life of a star, inward gravity and
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        outward pressure are in balance and the
                                     r
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       o o u t t w a r d     p r e s s u r e     a r e     i i n     b a l l a n c e     a n d     t t h e
                                                                h
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       outward pressure are in balance and the
                                                 u
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       s s t t a r     i i s     s t t a b l l e . .     B u t t     a s     a     s t t a r     b u r n s     t t h r o u g h     i i t t s
                                   s
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       star is stable. But as a star burns through its
        star is stable. But as a star burns through its
                                                           r
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                                                          d
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       f f u e l l     a n d     b e g i i n s     t t o     c o o l l , ,     t t h e     o u t t w a r d     f f o r c e s
                                                                r
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                                                    w
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        fuel and begins to cool, the outward forces
                                               o
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       fuel and begins to cool, the outward forces
                                                p
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       of pressure drop. When the pressure drops
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        of pressure drop. When the pressure drops
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       low enough in a massive star, gravity
                                  a
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                                                                  e

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        suddenly takes over and the star collapses in

                                                                    s
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                                                   t
       suddenly takes over and the star collapses in
                                                    a

                                                            t
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                                        p
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       j j just seconds. This collapse produces the
                                   o
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                                                       c
          s
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                               s


                                                               e
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       just seconds. This collapse produces the
                                                              e
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                                               r
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                                                    u
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                                          s
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                    n

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                                     u
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                                                  a
                                    s
                                    s
                                            n
                                                 a
                                            n
                                           r
        explosion we call a supernova.
                                       p
       e e
                                         e
                                         e
       explosion we call a supernova.               .
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                                 a
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