At which life cycle stage are stars the most stable?
494532
main sequence stars are at their most stable, during their main sequence lifetime when they are just burning hydrgen\n\nhope this is as specific as you need.
703897
Actually, most stars are binary. Most clusters of three or more stars is a relatively short-lived (cosmologically speaking) association that usually deteriorates to binary systems. When the cluster "sheds" its extra companions, these extra companions will either pair up with another single, if sufficient gravitated to each other, or in less frequent case, remain a single star.\n\nThe size of any star is determined by several factors, such as availability and composition of the nebula from which it is formed, any other forces, or field, that may exist in the nebula, etc.\n\nThe super giant is usually the shortest-lived star. Its life span has to do with the rate of fusion within the star and that is dependent upon the surface area as opposed to the volume of the star.
80797
It's a cycle of death and rebirth. A star will eventually go supernova, explode, and create stardust. These elements condense over millions of years to form a new star and new planets. This simple fact leads many scientists to the conclusion that a higher being must exist since it seems so neat and convenient to be just random chance. It seems like too useful a cycle, in other words. Like it was designed as such.
583534
Stellar Equilibrium\nExcept for brief intervals, stars must exist in both mechanical and thermal equilibrium.\n\ndude look at this site: http://www.peripatus.gen.nz/Astronomy/SteStr.html
330332
It depends.\n\nRed dwarfs, the smallest of stars, give off almost no light.  Because of the little energy they use, they can last trillions of years before just burning out.\n\nYellow dwarfs, like our sun, are different.  Like many people think, they are the ones that last billions of years before undergoing a transformation to a red giant.\n\nBlue giants and red supergiants last the shortest.  Blue stars give off insane heat and are some of the most marvelous and brightest stars.  The cost?  They burn energy so fast, they only live for millions of years.\n\nEither way, 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.\n\nIf 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.\n\nA super massive star runs completely out of gas.  It cant contrast, so it exploides and creates either a black hole or a neutron star in its place
1088976
here you go:\n\nhttp://www.enchantedlearning.com/subjects/astronomy/stars/startypes.shtml\n\nFrom your list it would be nova, but that is for a (relatively) short period of time.
341172
It depends on what stage they are in.  When stars are young, they are mostly hydrogen.  As they get older, they become mostly helium.  When really big stars come near the end of their lives, they start producing all sorts of other elements (carbon, iron, silicon, etc.), and neutron stars are made up of neutrons (effectively no elements, just elementary particles).
636967
Stars are huge, very, very hot balls of gas that shine brightly. Stars like all other matter is made up of millions of atoms. The simplest and lightest element is hydrogen gas. Enormous clouds of hydrogen gas and dust particles form in space. Gravity draws the dust and gas close together forming a huge clump, or mass.\n\nAs more and more matter is added to the mass, its gravity increases. This pushes the atoms of hydrogen gas closer and closer together. The mass begins to contract, or get smaller. It also gets denser and hotter. The center is hottest of all because the atoms are being squeezed together. The heat creates tremendous energy. Energy is the power necessary to make things happen.\n\nFinally, the crowding of the atoms, the heat, and the violent energy forces the hydrogen atoms to combine. This makes a new and heavier element called helium. The change of hydrogen gas to helium gas is called thermonuclear fusion. When this happens a star is born.\n\nTherefore , stars appear to be circular in shape because of the gravitational pull the mass exerts from all sides. It attracts hydrogen and dust particles with equal force from all sides and hence from a distance when we look at a star , it appears like a shining ball to us. When the Helium gas reaction takes place , it still appears cirular to us since the gravitational pull inside the star holds it together with equal force in all directions. \n\nThroughout a star's life, thermonuclear fusion goes on in its core, creating enormous energy. That energy becomes light and heat. It makes the star shine.\n\nThe new star will shine in the heavens for billions of years. It will stay that way until all its hydrogen gas has changed to helium.\n\nWhen a star has finally turned all its hydrogen into helium it is nearing the end of its life. Scientists believe that the amount of mass left in the dead star determines what will become of it.\n\nWhen a star has finally turned all its hydrogen into helium it is nearing the end of its life. Scientists believe that the amount of mass left in the dead star determines what will become of it.\n\nWhen an even bigger star — a giant star — uses up all its energy, it collapses even more than a white dwarf. Its mass and gravity are much greater. No space is left between the atoms. Electrons and protons inside the atoms are pushed together. They become neutrons and the giant star shrinks to a very small size. It is called a "neutron star" and is usually only a few kilometers in diameter. But its mass is so great that a tiny bit of neutron star — less than a teaspoonful — would weigh about half a trillion kilograms. That's as much as a long freight train loaded with bricks!\n\nSometimes, when a giant star collapses, particles called neutrinos are forced out of the atoms. As the neutrinos burst forth from the dying star, the star shines more brightly than any other object in the galaxy. It looks like an enormous sparkler. This is a "supernova."\n\nWhen the amount of mass left in a dying star is three or more times the mass of the sun, something very mysterious happens. A star this massive shrinks much faster than the white dwarf and the neutron star. Its force of gravity is very great. Nothing can escape it — not even light, which moves faster than anything else in the universe. This star becomes a "black hole."\n\nMany astrophysicists believe that there are black holes at the center of most galaxies, including our Milky Way. Although that may be so, our solar system is too far removed from the black hole for us to be influenced by its pull of gravity.\n\nAnother popular belief about black holes is that it can be a very vital tool in time travel\n\nCheck these links :) very interesting :) \n\nhttp://www.astronomycafe.net/qadir/q285.html\nhttp://science.howstuffworks.com/time-travel3.htm
857810
How astronomers come up with the timetable I don't know. It isn't as if we can watch the lifecycle of a single star, to see if we are right!\n\nBut..\n\nOur sun (Sol) is considered a  young star. Antares, a red supergiant, has burned up most of its original fuel, and has started converting energy in a different way, hence it's larger size and changed color. Technically, Antares is "older" than Sol.\n\nOf course, if you ask it, it may tell you it isn't a day over 29...
645894
No, main sequence stars (like our sun) last for about 10 billion years. It has lived for about 5 billion years or so, which means the sun has another 5 billion more years to live. After those 5 billion years are over the fusion process is stopped (due to the lack of hydrogen). The star collapses on itself and makes the star even hotter. All that heat fuses the helium and the star expands into a red giant. It will last in this form for another 100 million years or so. Then the outer layers of the red giant comes of creating a planetary nebula. Then after that gas is gone all that is left is the hot core or the white dwarf. The white dwarf cools and becomes a cold dead core (Black Dwarf)
217791
What stable? You can't see the storms so you think its stable. Many big stars disappear, only God knows how long this earth is here.
776571
Well, I guess I'm sorry I cannot answer your question, but I can tell you my opinion. (We just got done learning this In science class) I think that most of the stars began their very first cycle at the same time, therefor they would be in the same spot right now. Our sun, wich is a MSS will turn into a red giant in about 8 million years.
639748
That depends on the mass and composition of the star.  For an average one like ours, it's a little under 10 billion years.  More massive stars and those with higher amounts of lighter elements tend to burn much hotter, so they normally use up their fuel and leave the main sequence earlier than smaller and more dense stars.
80050
the sun will become a red giant before it gets near death, it will actually expand and the planet earth will have been eaten up and incinerated well before the suns death . such is the life cycle of all stars.
34588
Purely an opinion on my part, but..\nHydrogen - because it is the most abundant element and is a component of water ( the universal solvent)\nOxygen, because it is also a componant of water and is key to redox reactions\nCarbon - because it exists in many different states coal graphite diamond\n\nThe next two are more difficult, but I offer up Iron, because it is the last element able to be produced by a star without going Nova\n\nand Gold - for obvious reasons\n\n\nConsidering Chemical reactions, I would change in favor of Flourine, Sodium, Oxygen, Chlorine and Hydrogen
902366
Heres a web site that discusses the fate of stars of 20 solar masses and up:\n\nhttp://observe.arc.nasa.gov/nasa/space/stellardeath/stellardeath_3.html
468701
Depends on which part of the life cycle and which species.  For example, some species have a laval life span of several years, and an adult (breeding stage) life span of weeks to months...