How does a star die ?

Answer 1

A star dies when it runs out of fuel. The matter in the star's core is mostly hydrogen which it fuses into helium. When that runs out it begins its final days.

Some more massive stars will get a little extra time by fusing helium into carbon and carbon into nitrogen etc. for heavier and heavier elements up to iron. Unfortuantely, the energy needed to fuse iron into something heavier is too great for normal fusion, and so that is where the massive stars reach thier ends.

When a star dies there are several things that will happen and they depend on how massive the star is.

Smaller stars like the sun will balloon up in what is known as a red giant and eventually will puff off its outer layers of unfused hydrogen and helium to form a planetary nebula. The core of the sun will no longer be held up by the energy of fusion and will collapse down to a white dwarf. The matter of the white dwarf will be extreemly dense and it is only the electromagnetic repulsion of the electrons in the atoms that will stop the collapse. This is called "electron degeneracy pressure".

Were the sun a bit larger, the mass of the matter would create a gravity field powerful enough to overpower that electromagnetic repusion and the core would collapse even further. This mass at which this occurs is called the "Chandrasekhar Limit" after the Indian astrophysicist who first theorized it.

Once a more massive star dies, and collapses past the white dwarf stage, it reaches another limit. The electrons are effectively crushed down into the atom's nucleus where they meet the protons. There they electrically cancel each other out and form a neutron. What is left is a huge neutron roughly the size of a large city. This is a neurton star and often spins rapidly emitting radio signals that we can detect. Those are referred to as pulsars.

But if the star is even more massive, then the gravity is even stronger than the nuclear forces which maintain the structure of the neutron star and it collapses even further. This amount of mass is called the "Oppenheimber Limit". And once the Oppenhiemer Limit is breached, the gravitational collapse can't be stopped.

At this point the gravity of the object is so intense that the escape velocity exceeds the speed of light. And so you get a black hole.

As mentioned earlier, when a star starts to die, the smaller stars will puff off thier outer layers into a planetary nebula. But larger stars have a more dramatic ending. When those larger stars collapse, the crossing of the threshold of the Chandrasekhar Limit or the Oppenhiemer Limit will result in a massive explosion which we call a supernova.

I hope that helps. A little wordy perhaps, but a very interesting subject.

Answer 2

Stars consume their gasses in different stages. Most stars start off with lots of Hydrogen, they burn that and make Helium. Some of the Helium burns back into Hydrogen and back and forth, but eventually the star creates a bunch of Carbon. The Carbon stage will cause some smaller stars to become unstable and explode. Some larger stars will go to a Silica stage and some might even make it to a very brief Iron stage. These are very large stars.

When a star explodes, it creates heavier elements, which are then thrown out and help make new stars and planets all over again.

Answer 3

A star, like our sun, burns its hydrogen in a fusion reaction that produces helium. Once its supply of hydrogen is exhausted, it explodes and become a red giant. Eventually, if the core is compressed enough to start helium fusion, the star heats up and contracts and may finish as a white dwarf.

Larger stars also fuses heavier elements, all the way to iron. Once all its element are used, it collapses in a hughe explosion and becomes a supernova. Its remain is a neutron star, but if the star is big enough (more than 3 times the sun) it may become a black hole.

Answer 4

Many stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.7 billion years old, which is the observed age of the universe.The more massive the star, the shorter its lifespan will be, primarily because the greater a star’s mass, the greater the degree of pressure on its internal core, causing the star to burn its hydrogen fuel in greater amounts per second, thus depleting the star’s fuel much more rapidly. The most massive stars burn their fuel very rapidly and last about a million years on average, while stars of minimum mass (called red dwarfs) burn their fuel very slowly and last tens to hundreds of billions of years.

when stars run out of fuel they are dead. sun will also die some day.

Answer 5

Their fuel supply of hydrogen burns out, and have to resort to helium, expanding and cooling. When that rns out, if the star was a red dwarf, it doesnt even expand; it cools down and fades.

On an off-topic note: If it was a yellow dwarf, it became a red giant and srunk, red giant again, planetary nebua, then became a white dwarf. It will eventually become a black dwarf (not a black hole).

Also: A super massive star runs completely out of gas. It cant contrast, so it exploides and creates either a black hole from collapsing under its own mass, or a neutron star in its place.

Answer 6

When they say "die" they really mean the star gets so large and it's gasses run out so it implodes. The gasses left over then compress and build a new star so it's kind of "reborn". This only happens to stars every couple of million years.

Answer 7

First, what we call 'shooting stars' are actually not actual stars interior the perspective of going out. they're, extremely, small bits of rock in orbit around the solar that take place to collide with the Earth's atmosphere. The aerodynamic stresses of an merchandise like that interior the ambience reason it to warmth up and glow brightly, generating streaks of sunshine interior the sky. 2nd, the constellations we see interior the night sky purely signify a tiny fraction of the finished style of stars interior the Milky way. On a outstanding night, you will locate something like 10000 stars interior the sky. The Milky way includes approximately 4 hundred BILLION stars. And approximately 0.5 of those are crimson dwarf stars, of which NONE are close adequate for us to confirm with our eyes.

Answer 8

I would say, it is just like a big spoon of ice cream. It is scooped up, then the star will appear expended into gazic fuel. It will then expended so much until the lighted part would have no more gaz to continued to light it and it will exploded of the expansion of the gazes when it reached the highest volume of its expansion. It will become a quasar and will explode. just because of the gasic expansion.

Answer 9

stars are so massive. due to the pressure in the core of them, they begin to burn helium and get hot. but when the all the helium has burned, the star collaps. after that is depend on the mass of the star. if it's so massive, it turn into black hole or neutron star. if not, it turn into white dwarf.

Answer 10

Through billions of years...the hydrogen and helium fuel of a star runs out....the star changes shape...collapses into itself....then expandes making a BOOM!!!!