the star's mass, chemical composition, and size of it when it is born
Supernova
Supernova
Stars are classified by the H-R scale. They are classified by their luminosity and their temperature. They can also be classified by stage; our sun is a main sequence star while the center of the milky way is a black hole(the corpse of a super massive star).
Suns and stars are the same thing. To put it another way, our sun is a star. Some insist that the word 'sun' be used exclusively for our local star. Our sun is a very ordinary star; there are many stars in the Milky Way that positively dwarf our sun in size.
The biggest star in the milkyway is the VY Canis Majoris. It is the biggst star known.
I assume you mean, "how long a star lives". That depends mainly on the star's mass, with more massive stars using up their fuel way faster than less massive ones.
Supernova
Yes. The only known way to produce a black hole (although there may be others) is for a massive star to collapse, after it runs out of energy.
Supernova
Supernova
Stars are classified by the H-R scale. They are classified by their luminosity and their temperature. They can also be classified by stage; our sun is a main sequence star while the center of the milky way is a black hole(the corpse of a super massive star).
The way that a polypeptide folds to form the protein determines the proteins function.
There are no stars in the world. _________________________ However, the hypergiant star S Doradus may be the brightest star so far observed. Because the center of the galaxy is sheathed in nebulous gas clouds surrounding the massive black hole in the center of the Milky Way, there isn't any way (so far!) to observe stars on the other side of our own galaxy. S Doradus is the brightest star in the Large Magellanic Cloud.
The galactic center of the Milky Way is a compact object of very large mass (named Sagittarius A), strongly suspected to be a supermassive black hole.
The usual way a black hole forms is the following. A massive star ends its life in a huge supernova explosion. After that, the star runs out of fuel and collapses, due to its gravity. Actually, any star will collapse, whether it became a supernova or not. A supernova explosion can blow off much of a star's mass into space; in some cases, the star can blow up completely, leaving no remains. In any case, depending on how much mass remains once the star runs out of fuel, what remains will collapse into a white dwarf, a neutron star, possibly a quark star (quark stars are still very hypothetical), or a black hole. The most massive stars become black holes.
In the Milky Way galaxy, around one star is born each year and around one star dies each year. Throughout the universe, around 100 billion stars are born and die each year.
That is not yet known for sure. Most large galaxies have a supermassive black hole in their center. It is known how a massive star can convert to a black hole, but it is not currently known how such a black hole would acquire such a huge mass since its creation.