The Birth And Death of Stars
Birth
A star is born in a huge cloud of gas and dust. This is about 21 light-years away of the nebula begins to shrink under the pull of its own gravity. This forms a prostar which is about 60 million miles across. The star begins to take shape. The temperature continues to rise and nuclear fusion begins to take place. The pressure from inside the star finally equalizes the gravity pushing in, and the star stops contracting.
Birth
A star is born in a huge cloud of gas and dust. This is about 21 light-years away of the nebula begins to shrink under the pull of its own gravity. This forms a prostar which is about 60 million miles across. The star begins to take shape. The temperature continues to rise and nuclear fusion begins to take place. The pressure from inside the star finally equalizes the gravity pushing in, and the star stops contracting.
Death
A star will use up most of it's hydrogen and be left with helium. At this time there is not enough pressure crushing down on the star to create a nuclear reaction with helium. Nuclear reactions cease inside the star, and because there is no longer any outward push from fusion, the star begins to collapse upon its self. This collapse begins to create more and more pressure inside the star until it is sufficient to have the fusing process of helium begin in the core, while some of the remaining hydrogen burns just outside of it. The products of this helium burning is carbon and oxygen. and it becomes a red giant.
A star will use up most of it's hydrogen and be left with helium. At this time there is not enough pressure crushing down on the star to create a nuclear reaction with helium. Nuclear reactions cease inside the star, and because there is no longer any outward push from fusion, the star begins to collapse upon its self. This collapse begins to create more and more pressure inside the star until it is sufficient to have the fusing process of helium begin in the core, while some of the remaining hydrogen burns just outside of it. The products of this helium burning is carbon and oxygen. and it becomes a red giant.
Red Giants
after a few billion years a star runs out of protons, by this time the only thing left is the core, the outer layer still contains hydrogen but they are not hot enough to fuse. because the star runs out of fuel it begins to get cooler. weak radiation is read and once the radiation from the fusing shell has become weak and when the radiation reaches the surface of the star, the star becomes red this is now called a red giant.
after a few billion years a star runs out of protons, by this time the only thing left is the core, the outer layer still contains hydrogen but they are not hot enough to fuse. because the star runs out of fuel it begins to get cooler. weak radiation is read and once the radiation from the fusing shell has become weak and when the radiation reaches the surface of the star, the star becomes red this is now called a red giant.
what techniques are used to tell the birth and death of stars?
scientist's use large microscopes to look closely at the stars. scientist's then study a star or (stars) and record the information they receive from studying the stars and put all of the information together to come up with the final explanation of the birth and death of stars. scientists also study old monuments of people before our time explaining what they think happened and most of the time this is true.
scientist's use large microscopes to look closely at the stars. scientist's then study a star or (stars) and record the information they receive from studying the stars and put all of the information together to come up with the final explanation of the birth and death of stars. scientists also study old monuments of people before our time explaining what they think happened and most of the time this is true.
What are stars made of?stars are big exploding balls of gas, mostly made up of hydrogen and helium. stars are constantly exploding in a nuclear reaction. Th e huge reaction taking place in stars are constantly releasing energy called electromagnetic radiation into the universe this is why we can see them.