A PROTOSTAR is the 1st stage of the formation of a star.
Comment : But you could say that the nebula of gas and dust from which the protostar forms is actually the first stage. In that case, the answer is a "nebula".
The stage that comes first in the life cycle of a high-mass star is the main sequence stage. During this stage, the star fuses hydrogen into helium in its core, maintaining a balance between radiation pressure and gravity.
White dwarf stage. Its shrinks to a lot extent in this stage. Edit: A high mass star is usually one that becomes a supergiant then a supernova. Eventually this should leave either a neutron star or a black hole, depending on the mass of the star. The previous answer is for low mass stars.
The Sun is a medium mass star in main sequence.
The middle part of a star's life is called the main sequence stage. During this stage, a star fuses hydrogen into helium in its core, releasing energy that allows it to shine steadily. The Sun is currently in the main sequence stage.
It varies, depending on the stage of the star's development.
A star is "born" in a large cloud of dust and gas called a nebula
The first stage in a star's life is as a nebula. As the gravitational forces spin faster, the star enters it's second stage, that of a prostar.
The stage that comes first in the life cycle of a high-mass star is the main sequence stage. During this stage, the star fuses hydrogen into helium in its core, maintaining a balance between radiation pressure and gravity.
stellar nebula
Star Stage - 1955 First Date 1-4 was released on: USA: 30 September 1955
Formation of the star out of a giant cloud of gas and dust.
the fourth stage of a star is "supergiant" and its also the hottest stage
It doesn't differ from a star, it is a star and it is the second stage in a stars life after the nebula stage.
yes, it is the stage where a star dies and turns into a blackhole
Yes black hole is last stage of a star
Jim Morrison of the Doors
That would be a nebula, which is an interstellar cloud of hydrogen gas, dust, and plasma. It is the first stage of a star's cycle.