What are the similarities and difference between the elements in an early protostar and those in a young star formed from the stardust of older stars?

Both early protostars and young stars are formed from a clod of gas which collapses under gravity to form a star. Both types of star are mainly Hydrogen and some Helium.

Early protostars would have been formed from the gasses that were created soon after the big bang. They would be 75% Hydrogen, 25% Helium with traces of Lithium.

Young stars formed out of the remains of old stars would still be mainly Hydrogen. They would also have have small quantities of heavier elements which were formed by fusion reactions in the old stars. They would contain some carbon, oxygen and traces of heavier elements.

Similarities: 1. Both young stars formed from stardust and early protostars contain primarily hydrogen and helium; 2. Both undergo nuclear fusion processes in their cores, converting hydrogen into helium. Dissimilarities: 1. Young stars are actively undergoing nuclear fusion and have reached stable conditions; 2. Young stars formed from stardust have cleared most of their surrounding material through radiation pressure and stellar winds; 3. Young stars formed from stardust may contain heavier elements synthesized in previous generations of stars, although early protostarst

Similarities:

1. Both early protostars and young stars formed from stardust contain primarily hydrogen and helium, the two most abundant elements in the universe.
2. Both types of stars undergo nuclear fusion in their cores, where hydrogen atoms fuse to form helium, releasing energy in the process.
3. Early protostars and young stars have similar compositions in terms of trace elements, including carbon, oxygen, nitrogen, and heavier elements produced through nucleosynthesis in previous generations of stars.

Differences:

1. Early protostars are still in the process of gravitational collapse and have not yet initiated sustained nuclear fusion in their cores. In contrast, young stars formed from stardust have reached a stable state where nuclear fusion reactions sustain them against gravitational collapse.
2. Protostars are typically surrounded by dense clouds of gas and dust, which obscure their visible light. Young stars, on the other hand, have cleared much of the surrounding material through radiation pressure and stellar winds, making them visible to observers.
3. The temperature and pressure conditions within early protostars are much lower than those within young stars. As protostars contract and heat up, they eventually reach temperatures and pressures sufficient to ignite nuclear fusion and become young stars.

Overall, while early protostars and young stars share similarities in their elemental compositions and basic physical processes, they differ in their stages of evolution and observable properties.