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The Astrology of Space - Matrix Software

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<strong>The</strong> <strong>Astrology</strong> <strong>of</strong> <strong>Space</strong><br />

<strong>The</strong>re are at least two types <strong>of</strong> supernovae: SN I and<br />

SN II. Type I SN are powerful and brilliant, while Type<br />

II SR are faint and much less energetic. It is now<br />

believed that Type I SN are formed by the members<br />

<strong>of</strong> double-star systems. <strong>The</strong> cause <strong>of</strong> a supernova<br />

outburst is still the subject <strong>of</strong> intensive investigation<br />

(even controversy), but it is agreed that the onset <strong>of</strong><br />

the explosion is ultimately related to instabilities in the<br />

structure <strong>of</strong> the star that arise when the supply <strong>of</strong><br />

nuclear fuel in the central parts <strong>of</strong> the star is<br />

exhausted (see section on Evolution <strong>of</strong> Stars for more<br />

detail).<br />

<strong>The</strong>se instabilities occur only in stars whose mass is<br />

greater than about 1 1/2 times that <strong>of</strong> our Sun. Less<br />

massive stars, including the Sun, begin to contract<br />

when their nuclear fuel is consumed. In time, the pull<br />

<strong>of</strong> gravity is balanced by the pressure <strong>of</strong> degenerate<br />

electrons, an incompressible electron fluid that finally<br />

emerges because no two electrons can occupy the<br />

same energy state. When this stable configuration is<br />

reached, the star is called a white dwarf (which see),<br />

and gradually dies "not with a bang, but a whimper"<br />

as scientists delight in quoting. With stars <strong>of</strong> 1.5 solar<br />

masses, the density and temperature in the central<br />

core exceed the critical values beyond which stability<br />

is possible. <strong>The</strong> star collapses under the influence <strong>of</strong><br />

gravity and an explosion occurs. In supernovae the<br />

outer shells <strong>of</strong> the collapsing star are ejected at<br />

ultrahigh velocity. In some, if not all, cases, a dense<br />

relic is left behind – rotating neutron star or perhaps<br />

even a black hole! <strong>The</strong> resulting magnetic field on the<br />

surface <strong>of</strong> a neutron star can be more than a<br />

thousand billion times stronger than the average<br />

magnetic field on the Sun.<br />

180

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