Normal stars which have atleast 7.5% of Sun's mass, able to support fusion reaction in their core. They fuse hydrogen into helium until the hydrogen deep in the centre begins to exhaust. Fusion is the source of their heat and light energy. When they used up all their fuels, they collapse at the end of their life cycle.
They can collapse to form the following stars depending upon the mass of stars before collapsing.
White dwarf star -
It is as massive as Sun and its volume is equal to Earth's volume. This huge mass is compressed in such a small volume which makes it one of the densest forms of matter. The density is about 1 million gram per centimetre cube.
Our Sun will also become a white dwarf star after ten billion years later.
Neutron star -
This is the second densest dead star in the universe. The massive star with 15-20 times the mass of Sun, collapses with supernova explosion to convert into neutron star. The density is 10^14 grams per centimetre cube. If we think about one sugar cube of a neutron star, it will weigh 1 trillion kg on Earth. It can engulf our solar system if it is situated near the Jupiter!
Black hole -
This is the most densest structure in the universe. This is considered as a singularity, an one dimensional point which contains whole mass in an infinitely small space. Supermassive star having mass more than 30 time of Sun's mass collapsed, making the density and gravity infinitely large. It is so powerful that nothing even light can not escape from it.
It can absorb other stars and can merge other black holes to form supermassive black holes of million of Sun's mass.
They can collapse to form the following stars depending upon the mass of stars before collapsing.
White dwarf star -
It is as massive as Sun and its volume is equal to Earth's volume. This huge mass is compressed in such a small volume which makes it one of the densest forms of matter. The density is about 1 million gram per centimetre cube.
Our Sun will also become a white dwarf star after ten billion years later.
Neutron star -
This is the second densest dead star in the universe. The massive star with 15-20 times the mass of Sun, collapses with supernova explosion to convert into neutron star. The density is 10^14 grams per centimetre cube. If we think about one sugar cube of a neutron star, it will weigh 1 trillion kg on Earth. It can engulf our solar system if it is situated near the Jupiter!
Black hole -
This is the most densest structure in the universe. This is considered as a singularity, an one dimensional point which contains whole mass in an infinitely small space. Supermassive star having mass more than 30 time of Sun's mass collapsed, making the density and gravity infinitely large. It is so powerful that nothing even light can not escape from it.
It can absorb other stars and can merge other black holes to form supermassive black holes of million of Sun's mass.
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