Page 30 - COSMOS & H -Health - Science

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Is a Supernova the birth of a star?
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Is a Supernova the birth of a star?
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No, the Supernovae represent the explosive death of the most massive
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No, the Supernovae represent the explosive death of the most massive
stars in the Universe. But, these explosions give birth to neutron stars and
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stars in the Universe. But, these explosions give birth to neutron stars and
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black holes, and fuel galaxy evolution through the injection of heavy

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elements and mechanical energy. .
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elements and mechanical energy.
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Do supernovae affect us?
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Do supernovae affect us?
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If a supernova explosion were to occur within about 25 light-years of
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If a supernova explosion were to occur within about 25 light-years of
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Earth, our planet would probably lose its atmosphere, and all life would
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Earth, our planet would probably lose its atmosphere, and all life would
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perish. However, astronomers haven't found any dangerous supernova
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perish. However, astronomers haven't found any dangerous supernova
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candidates in our cosmic backyard, so there's no reason to worry
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candidates in our cosmic backyard, so there's no reason to worry
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How long do supernovae last?

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How long do supernovae last?
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A supernova typically lasts for several weeks to a few months. The initial l
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A supernova typically lasts for several weeks to a few months. The initial
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explosion occurs within seconds, but the afterglow and energy release can
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explosion occurs within seconds, but the afterglow and energy release can
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be observed for an extended period as the ejected material expands and
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How rare is a supernova?
How rare is a supernova?
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Astronomers believe that about two or three supernovas occur each
Astronomers believe that about two or three supernovas occur each
A s t r o n o m e r s b e l i e v e t h a t a b o u t t w o o r t h r e e s u p e r n o v a s o c c u r e a c h
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c century in galaxies like our own Milky Way. Because the universe contains
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century in galaxies like our own Milky Way. Because the universe contains
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so many galaxies, astronomers observe a few hundred supernovas per

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s so many galaxies, astronomers observe a few hundred supernovas per
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year outside our galaxy.
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year outside our galaxy.
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