Question

Which is a mark of a galaxy formed by collapse?

a) same age stars

b) abundant gas and dust

c) uniformly young stars

d) a mix of young and old stars

Answer 1

Same age stars is a mark of a galaxy formed by collapse.

Step-by-step explanation:

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Answer 2

Same age stars is a mark of a galaxy formed by collapse.

Explanation:

• Before a galaxy is formed, the building material of the galaxy in a protogalactic cloud that is rotating at a great speed rapidly accumulates and collapses in itself owing to its own gravitational pull.

• With this collapse, globular clusters are formed away from the nucleus of the galaxy.

• These clusters give birth to halo stars more or less at the same time. Thus, the stars that are formed of the same age.

• Sometimes, the reference of the age of the stars is taken to determine the age of the entire galaxy.