Briefly explain why stars that formed early in the history of the ...

[JGIBBSON]

Briefly explain why stars that formed early in the history of the galaxy contain a smaller proportion of heavy elements than stars that formed more recently.
 
  What will be an ideal response?

Question 2

If a neutron star attains a mass over ________ solar masses it becomes a black hole.
 
  Fill in the blank(s) with correct word

[softEldritch]

Answer to Question 1

The star-gas-star cycle gradually enriches the interstellar medium with heavy elements. Therefore, stars that formed early in the history of the galaxy were formed before much enrichment from supernova events could take place. Stars that formed more recently were formed from material that had been enriched by the many previous generations of stars.

Answer to Question 2

three

[JGIBBSON]

TYSM

[Kedrick2014]

Excellent