Group Q Stars

what are stars?
they are a luminous sphere of plasma held together by its own gravity. stars are cosmic energy engines that produce heat and light, they are born within the clouds and dust and scattered throughout most galaxies


how are stars created?
gas and dust can collapse under its own gravitational attraction as the clouds collapse the material at the centre begins to heat up this creates a protostar this will one day become a star gas and dust may break up into two or three blobs; this would explain why the majority the stars in the Milky Way are paired or in groups of multiple stars.As the cloud collapses, a dense, hot core forms and begins gathering dust and gas. Not all of this material ends up as part of a star — the remaining dust can become planets, asteroids, or comets or may remain as dust.A star the size of our Sun requires about 50 million years to mature from the beginning of the collapse to adulthood. Our Sun will stay in this mature phase for approximately 10 billion years. the biggest stars known as hypergiant can be 100 times as big as the sun.

we all know that some stand out more than others the brightness is the amount of energy put into the star this is called their luminosity and also how far away from earth they are. they're also different colours because not all the tempretures of them are the same,warm stars are white or blue whereas cooler ones are orange and red. stars occur in different sizes from a range of dwarfs to supergiants. at the end of their time large stars burst and create a supernova. the sun has a surface tempreture of 5,500 degrees celcius. if the core is much greater than 3 solar masses the contrats to make a black hole.

whats the biggest star in the universe?
the biggest star we know of today is R136A1 this star is 161 light years away from earth this star is more than 265 solar masses breaking the original limit this happened when 7 super masses of stars merged together. people think that R136A1 is near the end of its life and when it does it will become one of the biggest explosions ever called a hypernova. one closer to earth is eta carinae this is 250 times bigger than the sun and contains about 120 solar masses. it produces thousands more energy than the sun and is expected to explode as a supernova any day soon. the biggest possible star is 26,00 times bigger than the sun!


how does a star die?
once a star has run out of usable hydogen that it converts into helium a star then turns to several paths. say a star was 0.5 solar masses (half the mass of the sun) electron degenerancy pressure will prevent the star from collapsing in upon itself. Due to the age of the universe,scientist can only use computer modeling to predict what will happen to such a star. after its finished its active phase (hydrogen to helium) it will turn into a white dwarf. a white dwarf can come about in one of two;first,if the star is very small, electron degenerancy pressure will simply stops the collapse of the star, it is out of hydrogen and becomes a white dwarf. secondly,and more commonly, the core of the star can still be covered with some layers of hydrogen, which continue to fuse and cause the star to expand, becomeing a red giant. a red giant is a star in progress of fusing helium to create carbon and oxygen, if there isnt enough energy to do this the outer shell of the star starts to shed leaving behing a inert core

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