compare the elements in an early protostar and those in a young star formed from star dust of older stars?

To compare the elements in an early protostar versus those in a young star formed from star dust of older stars, we first need to understand the process of star formation.

1. Early Protostar:
- A protostar is a dense cloud of gas and dust within a molecular cloud, collapsing under its own gravity.
- During the early stages of star formation, the protostar is primarily composed of molecular hydrogen (H2) and some helium (He) gas.
- As the protostar continues to accrete matter, its core temperature rises, and nuclear fusion reactions begin.

2. Young Star formed from star dust:
- Stars form from the remnants of previous generations of stars. When a massive star reaches the end of its life in a supernova explosion, it releases enriched material into space, which mixes with the surrounding interstellar medium.
- The ejected material consists of heavier elements synthesized within the previous star's core through the process of nucleosynthesis, such as carbon (C), oxygen (O), nitrogen (N), and various metals like iron (Fe).
- The cloud of gas and dust formed from these stellar remnants can collapse to give rise to a new star.

Therefore, the main difference between the elements in an early protostar and a young star formed from star dust lies in their composition. The early protostar is primarily composed of lighter elements like hydrogen and helium, while the young star formed from star dust contains a mix of elements, including heavier ones, accumulated from previous generations of stars. This enrichment of heavier elements is a result of the nucleosynthesis processes occurring within stars and subsequent dispersal in the form of stardust.