Different Types Of Stars

After a time, the hydrogen runs out almost completely, and it collapses. New reactions begin to take place in the core and these reactions cause the star to expand rapidly. As the stars begin to deplete their new fuel, they switch to others. New elements are formed in the cores of stars but they become too heavy. The star has reached its end growth. When it reaches the end, a tremendous amount of energy is released and it begins to shed its outer layers, the gravity is too weak hold onto them anymore. Once the layers are removed, in the stars place is a fiery core called a planetary nebula. Eventually, the core runs out of fuel and it collapses. This star is now in a very dense state, and is called a white dwarf. Eventually, the white dwarf cools until it no longer shines. This dead star is called a brown dwarf.More massive stars, however, have more violent ways of dying. Some stars turn it into a supergiant. Supergiant stars are extremely bright, and are extremely large. Supergiant stars cores, can collapse violently and suddenly. This collapse causes a tremendous explosion, called a

The amount of fuel and the rate at which nuclear fusion occurs depends on the mass of the star. The mass of a star is the determining factor of how long it lives. A red-dwarf star is a star about half the size of our Sun. Due to its extremely low fusion rate, it is estimated that they could last for 10 trillion years. A medium-sized star like our Sun spends its main sequence stage up to 10 billion years.

At some point in the future when the hydrogen runs out, at that point the star will start to collapse itself under its own weight. It get denser, hotter until the point where it starts to use the helium atoms themselves as the fuel for the fusion. As the star begins to fuse helium, it creates more energy and that causes the outer layers of the star to start to expand. One day our sun will grow so large that it will swallow up the inner planets of our solar system. It will become a red giant, for the sun this will be the beginning of the end. Then they explode and become a supernova or for some biggggggggggeeeeerrr stars it would be a hypernova, which is waaaayyy stronger than a supernova; supernovas are some of the most beautiful sights in the universe. Lucky for us, our sun is too small to even explode and become a supernova. These explosion of stars are so powerful that it can outshine the whole galaxy during its explosion. For the

The larger a star, the shorter their lifespan is, and they explode as supernovae, blasting out powerful shockwaves that create a chain-reaction that spews throughout the galaxy. Within just a few million years, the galaxy is forming stars up to hundreds of times more than a normal galaxy would. When all of the gas available is used up in about ten million years, the galaxy calms down and the period

When observing a star, the lager it is the shorter its life is going to be. The smaller it is the longer the life. Shorter life is not saying much though, as the most massive stars live for billions of years. When a star reaches about middle age, it starts fusing hydrogen into helium. Once it has run out of usable hydrogen that it can convert into helium, it can then take on one of several paths. It can lead to white dwarfs, novae, supernovae, neutron stars or even black holes.

After the core of a star has depleted all its hydrogen in fusion, it undergoes its final stages of its life, or in other words, its death. The process path of a dying star depends on its mass. Low mass stars, from about 0.4 up to 8 solar masses will evolve from a planetary nebula to a white dwarf. Stars with larger the 8 solar masses will form supernovae, than either a neutron star for intermediate stars (8-25 solar masses) or a black hole for high mass stars (greater than 25 solar masses).

A Solar Mass Main Sequence Star will stay in its newborn state for about 90% of its life however when it is time to return to the universe, it must go through many stages before its final curtain call.

Stars are born of gas and dust and have a life cycle based on their original mass. Stars are not alive, but they go through stages. There are many sources that prove that this fact is true! These sources include the life cycle of stars, star classification, and types of galaxies. These different life cycles are for the high-mass stars and the low-mass stars.

A star has 5 definite stages and 3 stages which can vary between stars. The 5 definite stages are a Nebula, a Star, a Red Giant, a White Dwarf and a Red Dwarf. The stages that can vary are a Supernova, a Neutron Star and a Black hole. As the star goes through each stage, it can change size dramastically. An example of this is a Red Giant, which is 100 time the size of the Sun, compared to a Red dwarf, only 1 tenth the size of the sun (Life cycle). An interesting fact is “The closest star to Earth is Proxima Centauri, located 4.2 light-years away. In other words, it takes light itself more than 4 years to complete the journey from Earth. If you tried to hitch a ride on the fastest spacecraft ever launched from Earth, it would still take you more than 70 000 years to get there from here.” (Interesting facts)

Sixthly, I will discuss red dwarf stars. Red dwarf stars are very common in our universe. “They are main sequence stars that that have such low mass that they are much cooler than stars like our sun”. (www.phys.com) Red dwarf stars are able to keep the hydrogen fuel mixing into their core. So to their advantage, they can conserve their fuel much longer than other stars. “Astronomers estimate that some red dwarf stars will burn up to 10 trillion years. The smallest red dwarfs are 0.075 times the mass of the sun, and they can have a mass of up to half of the sun”.

There are two different life cycles for stars but they both start out as a 'Stellar Nebula'. It then splits off in to separate stars the Low Mass and The High Mass stars..

Then, overtime the giants gasses drift away from the core then the gasses appear as a cloud around a dying sunlike star. When the clouds disperse, gravity causes the remaining matter in the core to collapse inward. The core becomes denser and very hot, then the star becomes a white dwarf. A white dwarf is the hot, dense core of matter that remains from the collapse of a low mass

After a star lives for about 1 million years, it becomes a main sequence star. Once it becomes a main sequence star, it will then go through a proton-proton chain reaction. Since the force of gravity goes inward, the force of fusion will then go outward from the core. This process will continue for about 10 billion years even when the star is "burning" Over those ten years, the stars will eventually slowly run out of hydrogen. After it runs out of hydrogen, the core will fill up with helium.

The first process every star goes through before its end is the process of their core shrinking. When stars of at least .4 M begin to exhaust their hydrogen supply, the hydrogen starts to fuse in a shell that is outside the helium core. As the shell burns more hydrogen it is also producing more helium, this allows the core to increase in its mass and temperature. When the temperature increases greatly, helium fusion begins to start in what is called a helium flash, causing the star to rapidly decrease in its size and increase its temperature. Once the star has fused all of the helium out of its core, the product of the carbon will fuse which produces a hot core along with the outer shell made up of fusing helium. The more massive a star is,

Main sequence stars like our own sun enduring in a state of nuclear fusion during which they will produce energy for billions of years by replacing hydrogen to helium. Stars change over billions of years. When their main sequence phase ends they pass through other states of existence according to their size and other characteristics. The larger a star's mass, the shorter its lifespan is. As stars move toward the end of their lives, much of their hydrogen will be converted to helium. Helium sinks to the star's core and raises the star's temperature—causing its outer shell to expand. These large, puffy stars are known as Red Giants. The red giant phase is actually a prelude to a star shedding its outer layers and becoming a small, dense body called a White Dwarf. White dwarfs cool down for billions and billions of years, until they finally go dark and produce no energy at all. Once this happens, scientists have yet to observe, such stars become known as Black Dwarfs. A few stars avoid this evolutionary path and instead go out with a bang, exploding as Supernovae. These violent explosions leave behind a small core that will then turn into something called a Neutron Star or even, if the remainder is large enough, it is then turned into something called a Black Hole.