A main sequence star is a star that is fusing hydrogen in its core. Stars leave the main sequence when they run out of hydrogen and start to fuse heavier elements (starting with helium and finishing with iron).
The length of time a star remains on the main sequence depends on how massive the star is. The larger the star the more gravity it has and the tighter this gravity squeezes the core - this makes the core hotter and brings the hydrogen atoms closer together so the fusion process proceeds more rapidly.
Thus big stars will only spend a few tens of millions of years on the main sequence while stars the size of our sun will spend ten thousand million years on the main sequence, and smaller stars (red dwarf stars) will spend trillions of years fusing hydrogen.
The lifespan of a main sequence star is given by the relation:
T = 1 / M^2.5
Where T is time in solar lifetime (10^10 years) and M is mass in solar masses.
Therefore, T = 1 / 15^2.5 = ~0.001 solar years or 1.14755x10^7 years
That varies a lot, depending mainly on the star's mass. The largest stars are very short-lived; they might stay on the main sequence for just a few million years. Stars the size of our Sun, somewhere in the middle (note, however, that our Sun is already in the top 10 percentile!) stay on the main sequence a few billion years; red dwarves - once again, depending on their exact mass - up to several trillion years.
It depends on their mass. Low-mass stars last a lot longer than high-mass stars. A one-stellar-mass star like the Sun will probably last 10 billion years or so on the main sequence.
Depending on the mass of the star, anywhere from millions to billions of years.
It takes about 0.1 to 100 million years for the cloud to become a main sequence star.
A red dwarf is a low mass star which "burns" hydrogen so slowly that they have lifetimes longer than the age of the universe (13.7 billion years.)
From 10,000 years for the most massive stars (100 solar masses) up to 100 million years for the least massive stars (0.1 solar masses)
10 billion years
Millions to maybe a few billion years.
It is a main sequence star of class M. It can range in size form 0.08 to 0.45 solar masses, and a radius of less than 0.7 times that of the sun. A majority (76%) of main sequence stars belong to this category.
A main shock is the largest earthquake in a sequence.
no, as a hydrogen burning main sequence star.
a red giant
An unconformity. There are three main types: angular unconformity, disconformity, and nonconformity.
There are billions of stars that are not on the main sequence.
The smallest stars in the main sequence are the stars with cooler surface temperatures.
Of the stars you can see from Earth, 90% are in the main sequence.
"main sequence" is the tern.
Most of the stars in the universe are found on the main sequence. Stars fall off the main sequence when they begin to die.
main sequence stars , our sun is also a main sequence star
About 90% of the observed stars are on the main sequence. See related question
Main sequence stars include the hottest stars as well as the coolest ones.
main sequence stars , our sun is also a main sequence star
No. They have the lowest temperatures on the main sequence. The hottest main sequence stars are blue.
Main sequence stars are found in all galaxies.
Main sequence stars.