The most massive star (The star with the most mass) is a star in a super star cluster called R136 or RMC 136 in the Large Magellanic Cloud (LMC). [See related link for more information]
The star, for all its fame has a rather unremarkable name of R136a1. It has the mass of about 265 -> 300 solar masses (256 x the mass of the Sun - See related question).
See related link [BBC] for a pictorial size comparison.
It is a blue supergiant with a spectral type of O3. Because of its mass and intense luminosity (10 million times that of our own Sun) it, astronomically, will have a very short lifetime in the millions of years rather than billions.
At the end of its life, R136a1 will explode as a supernova and because of its relatively close distance to Earth (165,000 light years/ALU [See related question] it might be visible during the day.
This question is about the most massive star (mass), not the largest (Radius) [See related question]
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".
Main sequence stars vary widely in temperature and brightness, depending on their mass. While some main sequence stars, like red dwarfs, are cool and dim, others, such as blue giants, are hot and very bright. The majority of main sequence stars, however, are found in the middle range of the spectrum, often classified as yellow or orange stars like our Sun. Thus, it is not accurate to say that main sequence stars are mostly cool and bright; they exhibit a broad range of characteristics.
Some examples of star types that are not part of the Main Sequence are:Red Giants, Blue Giants, Brown Dwarfs, and White Dwarfs.When stars are plotted on a chart that compares their Temperature (color) to their Brightness (Luminosity), most of them fall into a diagonal line across the chart.That chart is known as a Hertzsprung-Russell diagram and the diagonal line on it is called the Main Sequence of stars.Stars on the Main Sequence fit this pattern because they are in balance between collapse and expansion. Their gravity that is trying to collapse them is in balance with their nuclear fusion that is trying to expand them.A difference to notice between Main Sequence stars and other stars is:Main Sequence stars are dimmer if they are cooler and brighter if they are hotter.Giant stars are brighter whether they are hot or cool.Dwarf stars are dimmer whether they are hot or cool.
The most massive main sequence stars are the brightest, (O main sequence star on Hertzsprung-Russel Diagram). Main sequence stars obey a mass-luminosity relation. On the H-R diagram the vertical axis is the brightness. So the stars along the top are the brightest (intrinsically).
A main sequence star is NOT a TYPE of star but a period in a stars evolution. Therefore all stars from the hottest to the coolest are on the main sequence at some stage - with the exception of brown dwarfs which do not reach the main sequence.
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".
Two types of stars that can form from nebula are main sequence stars, like our Sun, and giant stars, which are larger and brighter than main sequence stars. Main sequence stars fuse hydrogen into helium in their cores, while giant stars have expanded and evolved from the main sequence phase.
Main sequence stars vary widely in temperature and brightness, depending on their mass. While some main sequence stars, like red dwarfs, are cool and dim, others, such as blue giants, are hot and very bright. The majority of main sequence stars, however, are found in the middle range of the spectrum, often classified as yellow or orange stars like our Sun. Thus, it is not accurate to say that main sequence stars are mostly cool and bright; they exhibit a broad range of characteristics.
Some examples of star types that are not part of the Main Sequence are:Red Giants, Blue Giants, Brown Dwarfs, and White Dwarfs.When stars are plotted on a chart that compares their Temperature (color) to their Brightness (Luminosity), most of them fall into a diagonal line across the chart.That chart is known as a Hertzsprung-Russell diagram and the diagonal line on it is called the Main Sequence of stars.Stars on the Main Sequence fit this pattern because they are in balance between collapse and expansion. Their gravity that is trying to collapse them is in balance with their nuclear fusion that is trying to expand them.A difference to notice between Main Sequence stars and other stars is:Main Sequence stars are dimmer if they are cooler and brighter if they are hotter.Giant stars are brighter whether they are hot or cool.Dwarf stars are dimmer whether they are hot or cool.
The most massive main sequence stars are the brightest, (O main sequence star on Hertzsprung-Russel Diagram). Main sequence stars obey a mass-luminosity relation. On the H-R diagram the vertical axis is the brightness. So the stars along the top are the brightest (intrinsically).
A main sequence star is NOT a TYPE of star but a period in a stars evolution. Therefore all stars from the hottest to the coolest are on the main sequence at some stage - with the exception of brown dwarfs which do not reach the main sequence.
By definition and experiance sol as a main sequence star and as a class planet earth and the earths moon with some comets as life as we know it. But a star like a gas giant its gravity may be to strong. Sol as a main sequence stars has the right gravity for earth and counter clock wise rotation and gravity
The H-R diagram of a young star cluster shows a main sequence stretching from upper left to lower right, where stars are fusing hydrogen in their cores. It also may include some young, pre-main sequence stars located above and to the right of the main sequence, which are still contracting and heating up. Additionally, there might be some high-mass, short-lived stars in the upper region of the diagram, and low-mass, long-lived stars in the lower region.
Some of the types of stars in the constellation Hercules include main sequence stars, giant stars, and variable stars. There are also multiple binary star systems and star clusters present within the boundaries of this constellation.
On the HR diagram, the coolest stars are located on the right side, specifically in the red dwarf region of the main sequence. These stars have low temperatures, typically ranging from about 2,500 to 3,500 Kelvin. Additionally, some cooler stars can be found in the red giant area, which is located above the main sequence on the right side.
Stars are classified by their type and temperature. Amongst some of the types of stars in our galaxy are white dwarfs, blue giants, and red supergiants. Our own Sun is a yellow dwarf, and like most stars is a main-sequence star.
All of them - but mostly hydrogen & helium.