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Stellar Evolution

~300 answered questions
Parent Category: Stars
Stellar evolution is the life cycle of a star. Stars start out as clouds of gas and dust. The composition of the gas and dust will determine the stages that the star may go through.
The life cycle of a star can follow a few different paths depending on the mass it starts out with. Really massive stars may live for only a few million years before going supernova, while low mass stars such as the Sun may take billions of years to use up their fuel and then die relatively quietly.…
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Basically, the mass. The more massive the star, the shorter its lifetime.
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A neutron star is the remnant of a supernova explosion. Such stars are composed almost entirely of neutrons. A typical neutron star has a mass between 1.35 and about 2.1 solar masses, with a corresponding radius of about 12 km A neutron star is so dense that one teaspoon (5 millilitres) of its m…
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Because stars burn lighter elements through fusion into heaver elements.
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Stellar Evolution [See Link] - or Life of a Star. Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most massive) to trillions of years (for th…
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The theory of evolution states that most living organisms share common ancestry. Charles Darwin proposed this theory 150 years ago to account for the remarkable diversity of life around the globe, and to explain apparent successions of fossils. Since Darwin's time the theory of evolution has been m…
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Answer i would say its supernova (red giant is not hotter than the sun)
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Yes, there are.For details, click on the link in "Sources and related links" below.
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Alfredo will finally realize that he doesn't have any feelings of love towards Julia. The story of Dead Stars was written by Paz Marquez.
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In Brief: In about 5 billion years, the Sun will dramatically expand and become a red giant, but it won't explode. It won't ever become a supernova. An Explanation: It is true that the Sun is very slowly expanding and getting brighter right now. The reason for this is that as it is burning hydrogen …
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Stars have several cycles in their lifespan. The seven cycles of a star like our sun are Stellar Nebula, Protostar, Main sequence star, Red Giant, Planetary Nebula, White Dwarf, and Black Dwarf.
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stars are formed in a stellar nebula. clouds smash together making a protostar. more and more clouds spiral in the protostar making the clouds into hydrogen then a huge explosion finally makes the main sequence of a star. when a star is young it burns fast and hot and bright, and the light is blue w…
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stars forms by the reaction of three things the dusty clouds,helium and hydrogen.Stars have 5 stage in there lives sun is the youngest star.
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Stars have a typical path of development. The details of this path depend on their mass. Smaller stars, like our sun, will gradually grow hotter, until they become a red giant. Ultimately they will shed their outer layers, and a white dwarf remains. Much more massive stars might go nova in stead.
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At enormously high temperature and pressure.
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A star begins its life as a ball of gas and dust. Gravity pulls the gas and dust into a spere. As the sphere becomes denser, it gets hotter and eventually reaches temperature of about 10,000,000 Celsius in its center. As hydrogen combines into helium, energy is released in a precess called neclear f…
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A gamma ray burst results from an extremely energetic implosion/explosion, as in supernovae or hypernovae events, or the less likely possibility of the combination of 2 neutron stars.
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I suppose you are referring to the life cycle of a star, which starts out from a nebula. A nebula is a cloud of dust and gas that forms stars. Depending on the mass of a nebula, the star will either become a sun-like star, or a massive star. The sun-like star/massive star is the period of which the …
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A variable star is one whose brightness changes.
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The short answer is running out of hydrogen.Most stars (like our Sun) are in the "hydrogen burning" phase of their life.That is to say they are converting hydrogen into helium by nuclear fusion.This releases a lot of energy.The heat released by this reaction keeps the core (centre) of the Sun extrem…
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Stars form when enough hydrogen accumulates to cause enough internal pressure and heat to make the ball of hydrogen glow from the fusion of hydrogen to form helium. Depending on the size and temperature of the new star, it will fall along the HR Diagram as a class O,B,A,F,G,K or M star. Class O star…
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The corona is hotter than the photosphere because the sun's magnetic field carries energy upward from the surface and into the chromosphere and corona. The opposite effect is observed when the magnetic fields cause sunspots to form resulting in cooler surfaces.
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yes. stars are aged like us and eventully they will blow up. But more stars are formed. Some stars blow up, some don't. It depends on their mass. Stars having more than 3 times the mass of our sun will blow up when they die, stars having less than 3 times the mass of our sun will not blow up when t…
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That's a good question. Average star would fall in the center of the main sequence in the Herzsprung Russell diagram. I believe about eight billion years. Stellar evolution is determined solely by size of a star. The larger a star the shorter and more violent the life. I remember frontiers of astron…
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cannot be determined exactly, but it was roughly 6 billion years ago.
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Supernovae are caused by the gravitational collapse of massive stars. When the material in the core of the star reaches the density of an atomic nucleus, nuclear forces (actually "neutron degeneracy pressure," but that's a whole new topic) balance gravity and the collapse is suddenly halted. This cr…
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Thermonuclear fusion is still going on in the core of a red giant, but it is a different type of thermonuclear fusion. The center of the core has reached high enough temperature and pressure that it can now burn helium, producing carbon. 3 4He --> 12CThe large amount of energy released by this ty…
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because they can't be created by fusion in stars
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Sunlight or solar energy is one and two others are water and air. The sun will burn out in just over 6 billion years. A million or so years before then, the sun will expand, boiling off all of earth's water and atmosphere, before eventually engulfing earth itself. Nothing in this universe is truly …
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The endpoints of stellar evolution are: White Dwarf Neutron Star Black Hole The endpoint is dependent upon birth mass of the star.
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The longest stage of stellar evolution is the main sequence phase.
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What happens at the "end" of a star's life depends almost entirely on the original mass of the star. It will become a white dwarf star, a neutron star or a black hole. Small red dwarf stars will fade into white dwarf and (eventually) black dwarf stars. They fuse hydrogen into helium, but don't hav…
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Supernovae occur in the giant phase of the main sequence of a star, typically in a red giant star.
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The atmosphere would be fried and the Earth would disentegrate.
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As a G-type star fuses its hydrogen to helium, this helium will gather in the core. As a result, the core will contract under its own weight as hydrogen is being spent. The contraction causes an increased hydrogen fusion rate, increasing the temperature. When insufficient hydrogen remains in the cor…
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Main Sequence - star is stable because of Hydrostatic Equilibrium. Fusing Hydrogen to Helium in core. Stars spends about 90% lifetime as main sequence. This is were I found the answer - http://www.maa.mhn.de/Scholar/star_evol.html
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Go to google search again
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Stars usually begin their lives in stellar nurseries: (relatively) dense clouds of interstellar gases. Critical densities may be achieved when nearby stars go nova, at which time pockets in the nebula collapse under their own weight to form a protostar. If the mass of the protostar is sufficient, fu…
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All stars are different but a blue giant will only "live" for about a couple of million years. Our Sun will "live" for about 10 billion years.
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The life cycle of a star is simply determined by what element said star is currently fusing. Our sun is currently burning through its vast supply of Hydrogen, and when that runs out it will switch to Helium, and so forth. Every time the mass of the element it's fusing increases, the energy given off…
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The suns core is way hotter than the surface of the sun.
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This is because the core of the sun is where nuclear fusion is occurring.
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The sun is a population I G-type yellow dwarf in its main sequence.
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When the star becomes a "Red giant" is when the helium flash occurs.
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See related question.
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The sun will ultimately become a slowly cooling white dwarf.
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Well i really think its quite obvious. The fact that you asked this question in the first place must be an indication of your level intelligence. Obviously the stars internal temperature must rise at least 1200 Kalvin's before any sort of classifcation can be changed. The number of Kalvin's increase…
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The details are a bit complicated, and vary depending on the star's mass, mainly. I recommend you read the Wikipedia article on "stellar evolution" to get a general overview; then ask back here if you have any additional questions.
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It is named after the astrophysicist Subrahmanyan Chandrasekhar. In Simple terms: If the remnant core of a dying star has a mass lower than the Chandrasekhar Limit, then it will become a white dwarf star. Above this limit, it will explode, as a Type II supernova. More detailed: Stars produce energy …
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A supergiant or red giant. They are normally around 3,500 degrees C and are very bright, near -5 on the Hertzsprung-Russell Diagram. These are the largest stars in the galaxy and universe.
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it takes billions of years for a star to form
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The Big Bang theory is based on a false understanding of redshift as exclusively representing distance and dopler effect. It was "falsified" many years ag by an astronomer named Halto Arp who photographed many instances where a light object with a high red shift is clearly between us and an object w…
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Because iron has no more excess binding energy left to release. Iron fusion consumes energy, it does not generate it.
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phase plane in stellar structure
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Star of one stellar mass, red giant, white dwarf, planetary nebula
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1) Hydrogen and some helium and a fairly small amount of lithium were formed very shortly after the start of the Universe, when matter cooled down enough for quarks to join into nucleons, and for some nucleons to join into heavier elements. There wasn't enough time to form any of the heavier element…
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Star clusters are collections of same-age stars that remain intact for billions of years. When plotted on a H-R diagram, a cutoff point of stars leaving the main sequence and massive stars further evolved are shown, confirming the theory of stellar evolution.
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Stellar fate is linked to stellar mass. For the very low mass Red Dwarfs, the final stage is a White Dwarf star. For Sun sized stars, the end stage is again a White Dwarf, following a brief fling as a Red Giant. For moderately more massive stars, it's still a White Dwarf. For really massive stars, i…
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White dwarf stage. Note that not all stars reach this stage. Some stars experience runaway criticality and go supernova. Also, white dwarf stars in binary systems can still go nova if they are acquiring hydrogen from their partner.
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1.1 Stars are born into a big cloud of dust and gas known as 'nebula', and the bigger its mass the shorter its life cycle. The nebula has hydrogen gas which is pulled by gravity and begins to spin. As the spinning gas gets faster, it heats up and becomes a protostar. Gradually, the temperature reach…
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I am not aware that there is any such law. Although there are various typical paths of development for stars, depending on their mass, composition and environment.
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hydrogen is what stars are mostly made Being the reservoir from which new stars are born in the Galaxy, interstellar matter is of fundamental importance in understanding both the processes leading to the formation of stars, including the solar system, and ultimately the origin of life in the univers…
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A supernova, or in the case of a smaller star, a nova.
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Energy is liberated through fusion reactions, producing heavier and heavier elements. There are two transient elements heavier than iron which are produced by standard stellar nucleosynthesis, but these are short lived and decay into lighter elements. Iron is the heaviest element forged in the heart…
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The remnant core of a star that becomes a supernova will normally be a neutron star, or possibly a pulsar (a rapidly spinning neutron star). The largest of stars would theoretically create a black hole, a singularity containing all of the core's mass at a single point and preventing even light from …
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size and diameter
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The formation of a protostar from a nebula. As the protostar forms, it accretes more mass from the cloud and spins. As it gains more mass, it eventually becomes massive enough to ignite the core and become a star. The protostar is the first step in the evolution of any star.
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It is a G-type giant star.
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Gravitationally confined thermonuclear fusion of hydrogen into helium inside a small volume at the core of the sun, where temperature is so high that the electrons and protons of the hydrogen atoms are completely separate gasses (plasma) and pressure is so high that the density of these gasses is hu…
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The stars with an A-type spectrum are the hottest common stars, but early-stage stars with a B-type spectrum are even hotter. The order of temperature is B-A-F-G-K-M for common stars. The M-type stars are the coolest common stars and they definitely look red, e.g. Antares, Betelgeuse. Remember t…
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Gravitational instability of molecular nebulae causes formation of protostar, which evaluates to the star.
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Scientist believe that stellar evolution contained only hydrogen and then helium.
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G-type stars, like the sun, will generally go through their main sequence, growing brighter all the time, until they expand to red giants, followed by a helium flash (or possibly several flashes), followed by the shedding of the outer layers of the star, at which time a slowly cooling white dwarf re…
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Stars that are massive enough are unlikely become red giants; instead they will destroy themselves as type II supernovas.
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I don't know, but I need an answer!
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The apparent visual magnitude of Beta Herculis is 2.81. It has been known since 1899 that it is in fact a binary star, and modern measurements (including satellite telescope) have resolved the motions and apparent sizes of the two bodies.
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Star clusters are ideal for figuring out certain things of stellar evolution because every star in a cluster is made of basically the same material and therefore has the same composition, they are basically at the same distance from the earth, and they all basically move the same way. This is ideal …
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Star of one stellar mass, red giant, white dwarf, planetary nebula
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Astronomers estimate the mass of stars at the "main-sequence turnoff" on the HR diagram. Observationally, they use the luminosities and colors of the stars. Then they can plot the stars on the HR diagram. For more details, use the "related links" below.
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Stars are made up of hot gas. It is spherical in shape. At end of the world there will be no star in the sky. That will be the end time. These processes are contiguous with both the coalescence of Primordial Interstellar Gas Clouds; and as well, they are also contiguous with the prodigious expulsio…
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When a star has used up all the hydrogen in its core, it has reached the end of the main sequence. Subsequent developments depend on the mass and composition of the star. Sun-type stars may expand and continue to fuse ever heavier elements in and about their core, until fusion no longer yields suffi…
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We study star stages and cycles through teloscopes and time-lapse photography. Generally in the same way we appreciate life-changes among a human population, which consists of babies, toddlers, children, teenagers... we notice that these reveal different traits. It's the same with stars. We see the…
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no, it formed from a nebula, then condensed
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The more mass a star has, the more quickly it fuses its hydrogen supply and therefore the more quickly it 'dies.' When fusion in the core stops, the star undergoes an event depending on its mass. At this point at which fusion stops, compression from gravity exceeds outward expansive force of the sta…
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What is capella star life cycle
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Stars cannot fuse any other elements heavier than iron simply for the fact that it does not produce energy. However, what comes next mainly depends on how much mass is contained within the star itself. If the mass of the star is 1.4 times the size of our sun, the electron degeneracy pressure (what h…
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Nebulaprotostarmid sized starred giantnovawhite dwarfblack dwarf:)
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The heaviest elements occurring in nature are formed inside supernovae, through nucleosynthesis.
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Stellar evolution states that stars are powered by a hydrogen fusion reaction. When a star has burned up its hydrogen, this reaction runs out, and its core will contract and heat up causing the hydrogen shell to ignite. This causes the star to expand into a giant star. Depending on the solar mass of…
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Although at the end of a stars life - another "type" of star is born, they are different to the "normal" type of star and are "star" in name only. Most "remnants" of stars should be classed as degenerate stars. Our Sun (a star) will first turn into a red giant star [See related question] and then a…
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