Answer:
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. 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. Another way to say it is 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.
The energy source is one of the distinctions between a young star and a protostar.
Stars are the objects found in the universe which composed of helium and hydrogen gases.
A young star was formed from nuclear energy but the protostar doesn't compose any such energy. The stars were created from the conflict between radiation pressure and gravitational force. it takes about thousands of hydrogen atoms combined to form one star.
Therefore, both the stars differ on the basis of energy sources.
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