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It may be either. Juvenile means young.
The Sun is a medium mass star in main sequence.
A protostar is the first building block of the main star. As it has not yet accumulated enough mass to join the main sequence, it will be smaller than the main star. The next stage will be a T Tauri star.
Yes.
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.
High mass.
Ultimately the mass a star has at the end of its life depends on its initial mass. This mass determines what stages a star will go through in its death throws.
A high mass star will leave behind either a neutron star of a black hole.
High mass.
no the sun is a medium mass star.
What are the small dense remains of a high mass star
The sun is an intermediate-mass star.
the high mass star's core collapse because its gravity
It can't. A blue star is a high-mass star. A yellow star has a medium mass.
It may be either. Juvenile means young.
The Sun is a medium mass star in main sequence.
A protostar is the first building block of the main star. As it has not yet accumulated enough mass to join the main sequence, it will be smaller than the main star. The next stage will be a T Tauri star.