Spica is a dual star system, with the two members too close for resolution by the best telescopes. The larger, primary star is a blue-white giant, and does have the potential to end it's life as a supernova. The primary is not a main sequence star. The secondary, about 70% the size of the primary, is a main sequence star, also blue white.
The length of time a star stays in the main sequence phase depends on its mass. For example, a star like the Sun will remain in the main sequence for about 10 billion years, while more massive stars will have shorter main sequence lifetimes, and less massive stars will have longer main sequence lifetimes.
The "main sequence" basically consists of all those stars that fuse hydrogen-1, converting it into helium-4. A massive star will remain in the main sequence while it has enough hydrogen-1; but since it gets hotter and burns its fuel much faster, it may stay there only for a fairly short time - in the case of the most massive stars, just a few million years.
A star typically stays as a stellar nebula for a few million years to tens of millions of years before nuclear fusion ignites within it, transforming it into a main sequence star. This process occurs once the internal pressure and temperature reach a point where hydrogen fusion can occur.
Capella is currently in the stage of its life known as the "main sequence." This is the stage where stars like Capella are burning hydrogen to produce energy through nuclear fusion. It is a stable phase in a star's life cycle where the star maintains a balance between gravity pulling inward and energy pushing outward.
our Sun will eventually become a red giant and a white dwarf.... Once the sun finishes fusing Hydrogen into helium it will start fusing helium. It will need more pressure to do this so it will expand. But it will cool a little as it expands. It all has to do with equilibrium. Our sun will become a red giant and expand to about half way between earth's orbit and mars' orbit. This will not happen for another 5 billion years or so supposedly since as far as we can tell stars like our sun stay in the main sequence for 10 billion years give or take and our sun is about 5 billion years old or so.
An O star will stay on the main sequence for millions of years whereas a M star can stay on the main sequence for billions and billions of years.
About another 4.5 to 5 billion years
The length of time a star stays in the main sequence phase depends on its mass. For example, a star like the Sun will remain in the main sequence for about 10 billion years, while more massive stars will have shorter main sequence lifetimes, and less massive stars will have longer main sequence lifetimes.
The "main sequence" basically consists of all those stars that fuse hydrogen-1, converting it into helium-4. A massive star will remain in the main sequence while it has enough hydrogen-1; but since it gets hotter and burns its fuel much faster, it may stay there only for a fairly short time - in the case of the most massive stars, just a few million years.
Around 10 billion years.
The energy source is hydrogen undergoing nuclear fusion to helium. The time that lasts depends on the mass of the star but it usually takes a few billion years.
As the gases in a protostar begin to collapse, the central core begins to heat up due to pressure. As more gases are absorbed, the greater the pressure. Once the temperature of the core reaches 10 million degrees K, hydrogen fusion begins, and the star begins it's life on the main sequence. The star will stay on the main sequence whilst it still has hydrogen to fuse. Once all the hydrogen has been used, the star will drop out of the main sequence. Protostar stage in the stellar evolution. [See related question]
Main Sequence stars are in the stable phase of their life cycle where they fuse hydrogen into helium. As a result, they stay on the Main Sequence for much longer than they do in the Red Giant or White Dwarf phases, leading to a higher abundance of Main Sequence stars. Red Giants and White Dwarfs represent later stages of stellar evolution, where stars have exhausted their hydrogen fuel and expanded or contracted accordingly.
Blue main-sequence stars have shorter lifespans compared to other stars because they burn through their fuel at a faster rate due to their high mass and temperature. This results in them using up their hydrogen fuel more quickly and ending their main-sequence phase sooner.
As long as they stay babies is how long they stay babies.
how long would you stay with us how long would you stay with us
The Sun is constantly changing it's state as it converts hydrogen into energy. The Sun will stay on the main sequence for about another 4.5 billion years. After that it will expand into a red giant.