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 <sect1 id="ai-stars">
 <sect1info>
 <author>
 <firstname>Jason</firstname> <surname>Harris</surname>
 </author>
 </sect1info>
 <title>Stars: An Introductory <acronym>FAQ</acronym></title>
 <indexterm><primary>Stars</primary></indexterm>
 
 <qandaset id="stars-faq">
 
 <qandaentry>
 <question>
 <para>What are the stars?</para>
 </question>
 <answer>
 <para>
 <firstterm>Stars</firstterm> are gigantic, self-gravitating spheres
 of (mostly) Hydrogen gas.  Stars are also thermonuclear engines;
 nuclear fusion takes place deep in the cores of stars, where the
 density is extreme and the temperature reaches tens of millions
 of degrees Celsius.
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>Is the Sun a star?</para>
 </question>
 <answer>
 <para>
 Yes, the Sun is a star.  It is the dominant centerpiece of our
 solar system.  Compared to other stars, our Sun is rather ordinary;
 it appears to be so much bigger and brighter to us
 because it is millions of times closer than any other star.
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>Why do stars shine?</para>
 </question>
 <answer>
 <para>
 The short answer is: star shine because they are very hot.  It is
 really no more complicated than that.  Any object heated to
 thousands of degrees will radiate light, just like stars do.
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>The obvious next question is: why are stars so hot?</para>
 </question>
 <answer>
 <para>
 This is a tougher question.  The usual answer is that stars get
 their heat from the thermonuclear fusion reactions in their cores.
 However, this cannot be the ultimate cause for the stars' heat,
 because a star must be hot in the first place for nuclear fusion to be
 triggered.  Fusion can only sustain the hot temperature; it cannot
 make a star hot.  A more correct answer is that stars are hot because
 they have collapsed.  Stars form from diffuse gaseous nebulae; as the
 nebulous gas condenses to form a star, the gravitational potential
 energy of the material is released, first as kinetic energy, and
 ultimately as heat as the density increases.
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>Are stars all the same?</para>
 </question>
 <answer>
 <para>
 Stars have many things in common: they are all collapsed spheres of
 hot, dense gas (mostly Hydrogen), and nuclear fusion reactions are
 occurring at or near the centers of every star in the sky.
 </para><para>
 However, stars also show a great diversity in some properties.
 The brightest stars shine almost 100 million times as brightly as the
 faintest stars.  Stars range in surface temperature from only a few
 thousand degrees to almost 50,000 degrees Celsius.  These differences
 are largely due to differences in mass: massive stars are both hotter
 and brighter than lower-mass stars.  The temperature and Luminosity
 also
 depend on the <emphasis>evolutionary state</emphasis>
 of the star.
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>What is the Main Sequence?</para>
 </question>
 <answer>
 <para><indexterm><primary>Main sequence</primary></indexterm>
 The main sequence is the evolutionary state of a star when it is
 fusing Hydrogen in its core.  This is the first (and longest) stage
 of a star's life (not including protostar phases).  What happens to a
 star after it runs out of core Hydrogen is addressed in the stellar
 evolution article (coming soon).
 </para>
 </answer>
 </qandaentry>
 
 <qandaentry>
 <question>
 <para>How long do stars last?</para>
 </question>
 <answer>
 <para>
 The lifetime of a star depends very much on its mass.  More massive
 stars are hotter and shine much more brightly, causing them to
 consume their nuclear fuel much more rapidly.  The largest
 stars (roughly 100 times as massive as the Sun), will run out of
 fuel in only a few million years; while the smallest stars (roughly
 ten percent the mass of the Sun), with their much more frugal
 consumption rate, will shine on (albeit dimly) for
 <emphasis>trillions</emphasis> of years.  Note that this is much
 longer than the Universe has yet been in existence.
 </para>
 </answer>
 </qandaentry>
 
 </qandaset>
 </sect1>