The
Radioactive Bodies
In Universe
The
Nature
Of Universe
In The
Ancient's
Point
Of View
The Origin Of
Matter And
It's Spread
In Universe
In
this section we’ll know about the bodies which have radio-active
ability, or which have the ability to emit radiations and most of them are
stars, there’s many of this bodies but the most important of them are
what we will talk about.
This
section includes the following topics:
Nova
star:
stars appear
suddenly in a very shiny state it continue for several days then it
disappeared again and it is considered as a stage in dwarf stars stages
and that happen only in the stars which have double system (i.e. two stars
rotate around each other), the only explanation that the dwarf stars
begins to die then he take his mate's matter so his mass becomes
larger that he begins to burn so the dwarf star begin to be shiny because
of the nuclear burning then the dwarf star explode after that the dwarf
star may die and change into white dwarf or it may renew this burning some
of these stars can burn down more than 3 times before its death after
emitting a lot of radiation.
Supernova
star:
Supernova stars contradict with
nova stars inspite of the great connections between this names (nova and
supernova), and this state belongs only to giant and super giant stars, giant
stars is equal 50 times of our sun, but if the stars is bigger it
will not die but it will divided into two stars, and
what happens in the supernova state that the giant star reach to the last
stage in his stage (the last stage is the burning of silicon), then the
reaction stops, and the pressure decreases, so the giant star becomes
unstable the density of the stars increases and the huge pressure around
the center lead to the increase of the temperature, in few hours, nuclear
reaction happen in a huge temperature and pressure, then the giant star
turns into a supernova star which explode throwing its matter into space
which go with 1/3 of light velocity (i.e. 100 000 km/sec.) as light
velocity = 3x108 m/sec
the atmosphere of that giant stars also turns into Nebula in which new
star are formed, the center of the supernova turns into a neutron stars.
Neutron
star:
Neutron
stars is considered as a remain of a supernova star, and it rotate around
it self rapidly emitting a lot of neutron with very high energy with x-rays
and neutron star is very small as his radius doesn’t exceed 10kms. The
most famous neutron stars is found in the crab ,i98ny76nebula which is
6520 light years away from us and it was from the remains of supernova in
1054.
Plusar
star:
Plusar
was discovered in 1968 and it is like stars (emits neutron and x-rays) but
it rotates around itself in a very high velocity, some of them reaches 12
or 13 cycle/sec. But
there’s plusar that rotate in a crazy velocity sometimes reaches to 600
cycle per second.
White
dwarf star:
White
dwarf considered as a density of any stars has sun’s size of 1.4 of
sun’s size, its radius is usually 6000 km or less than that i.e. white
dwarf is similar to earth’s size, it emits x-rays, the most famous is
Sirius-b.
Black
holes:
Black
holes is a remain of super giant star after its burning in to a supernova, it
is very small and its radius doesn’t exceeds 4 kilometers, it may
shrinks or becomes larger but it is a very rich source of radiation of
gamma and x-rays, we can say that black holes swallow stars inspite of
it’s small size it has huge density and it’s gravitational force is
very high.
Black hole
Active
galaxies:
It’s
not vital that the radio-active bodies must be stars, some galaxies
like active galaxies, Seyfert galaxies, Mar karian galaxies, N-type galaxies,
and Bl-Lacerta galaxies are also a source of radio-activity, all of them
were studied in the later section, quasars also considered as
radio-active bodies.
Active galaxy
