In this universe there are many clouds of helium and hydrogen called as nebula. Due to the
inter atomic gravity they start
to vibrate and there is nuclear fusion
due to the heat produced by vibration and a star takes birth .Depending
on the mass of star its life is nearly 10 million years when the iron core of
the star increases the star explodes forming a hypernova or a supernova after a
hypernova or a supernova if the
core has mass more than 3 solar masses it becomes a black hole and if less it
becomes a neuton star. When a black
hole’s mass becomes 1.4 times solar masses
it turns into a neutron star.
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