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Because they have exhausted their supply of hydrogen in the core.
They might reenter the main sequence later, but that will be using hydrogen in the shell (the branch phase) rather than the core.
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Does the blue main-sequence star have a longer life than other stars?
It depends on the mass of the star. The lower the mass, the longer it will stay on the main sequence. A red dwarf may stay on the main sequence for trillions of years, while a blue star only lasts a few million years.
Is the milky way a main sequence star?
All stars that are in hydrostatic equilibrium are on the main sequence, where outward thermal pressure from the hot core is balanced by the inward gravitational pressure from the overlying layers.See related questions
Which main sequence are the brightest?
Percentage wise - all of them.There are a number that have progressed off of the main sequence:-Betelgeuse. CNO cycle.Rigel: Shell burning.
Why there are so many Main Sequence stars compared to the much smaller percentage of stars that are Red Giants and White Dwarfs?
For three reasons. 1) Hydrogen is the most abundant element in the universe. 2) ALL stars spend a part of their life on the main sequence because wile on the main sequence the fuel they are fusing is Hydrogen. 3) For a given mass of hydrogen, the energy output created by fusing hydrogen is the greatest of all fusible elements (i.e the elements up to Iron). Thus as stars start fusing other elements (and thereby moving off the main sequence) they burn through their fuel very quickly and either explode a supernovae or decay into white dwarfs (depending on their initial mass). One may also note that the most common type of stars are red dwarf stars on the main sequence and this is because the rate of hydrogen fusion depends on the stars mass a really big star will only last a few million years while a small red dwarf will shine for trillions of years. Thus the big stars die quickly while the small ones last a long time so one ends up with more of them (more smaller stars may also be produced in the first place too).
When the Sun moves off the main sequence it will next become a?
It will become a red giant.
Are most stars in our galaxy found in the main sequence?
Most of the stars in the universe are found on the main sequence. Stars fall off the main sequence when they begin to die.
Stars leave the main sequence when they?
Stars are said to be off the main sequence when they stop fusing hydrogen into helium.
When does a star lose its main sequence?
Stars don't "lose" their "main sequence", because it's not something a star can "have" in the first place.Stars are more properly described as being "on" or "off" the "main sequence", and "sequence" isn't a good word for it anyway, because it implies that there is an actual sequence of events involved; in fact, the normal life sequence of a star has it going off the main "sequence".It may help if you stop thinking of them as "main sequence" stars and start thinking of them as either dwarfs or type III stars.
A solar mass star will evolve off the main sequence when?
it builds up a core of inert helium.
Which main - sequence stars are the brightest?
Percentage wise - all of them.There are a number that have progressed off of the main sequence:-Betelgeuse. CNO cycle.Rigel: Shell burning.
What will burn through its fuel first a main sequence star or a super giant?
Main sequence stars do not really exist - well they do, but read on. Main sequence is a stage in a stars life - where it converts hydrogen into energy, not a particular star or type of star. All stars go through a main sequence, from the smallest to the largest.However, in general, the larger the star, the faster it will burn off it's fuel.
Main sequence stars are also called stars?
A "main sequence star" is not really a type of star but a period in a stars life. When a star is in "main sequence" it is converting hydrogen into helium. It is then usually called a dwarf star. This is the longest period in a stars lifetime. Our Sun is a yellow dwarf in "main sequence".
When was Off the Main Sequence created?
Off the Main Sequence was created in 2005-11.
How many pages does Off the Main Sequence have?
Off the Main Sequence has 738 pages.
Which region contains the most stars in the HR Diagram?
Several regions of the HR diagram have been given names, although stars can occupy any portion. The brightest stars are called supergiants. Star clusters are rich in stars just off the main sequence called red giants. Main sequence stars are called dwarfs.
What is the ISBN of Off the Main Sequence?
The ISBN of Off the Main Sequence is 1-58288-184-7.
Why are most stars you see in the sky main-sequence stars?
most stars you see in the sky are main-sequence stars because stars spend most of there life time as a main secuence stars then they turn into red giants and enggulp the inner planets blow off there outer layer and become white dwarf the will eventually die and give off huge clouds off gas and will become a new star.
