Why does the average chemical composition of stars now forming ...

[bio_gurl]

Why does the average chemical composition of stars now forming differ from that of older stars?
 
  What will be an ideal response?

Question 2

In the collapse of a protostar ___________________ _ energy is converted to ___________________ _ energy.
 
  Fill in the blank(s) with correct word

[harveenkau8139]

Answer to Question 1

The first stars formed from gas that was metal poor, and the only survivors of these early generations are low-mass, long-lived stars. Their spectra, which indicate the composition of their atmospheres and not their cores, still show the composition of the metal-poor gas from which they formed. Population I stars such as the Sun formed more recently, after the interstellar medium had been enriched in metals, and their spectra show stronger metal lines. Stars forming now have even higher metal abundances.

Answer to Question 2

potential; thermal

[bio_gurl]

Wow, this really help

[mammy1697]

Excellent